Thread: Ultimate Trouble code guide

　
P0243
Trouble Code Conditions:
Key on or engine running; and the PCM detected an unexpected voltage on the Boost Control Solenoid control circuit for 30 seconds. The PCM uses an output driver module (ODM) to enable several current-driven devices that are needed to control various engine and transaxle functions. Each ODM can control several output device functions.
Possible Causes:
Boost solenoid circuit is open between the solenoid and PCM
Boost solenoid circuit is shorted to ground
Boost solenoid power circuit is open to system power
Boost solenoid is damaged or has failed
PCM has failed
　
P0300
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0107, P0108, P0116-P0118, P0121-P0123, P0125, P0336, P0341, P0502-P0503, P1106-P1107, P1114, P1115, P1121, P1122, P1336, 1351, P1361, P1362 and P1374 not set, engine speed from 525-6600 rpm, ECT sensor at 21-255ºF, TP angle steady, system voltage over 10.0v and the PCM detected a crankshaft speed variation in 2 or more cylinders characteristic of a misfire. If the misfire is severe, the MIL will flash on/off on 1st trip!
Possible Causes:
Base engine mechanical fault that affects one or more cylinders
Fuel metering fault (high fuel pressure or fuel contaminated)
EVAP system problem or the EVAP canister is fuel saturated
EGR valve is stuck open or the PCV system has a vacuum leak
Ignition system fault (a coil) that affects more than one cylinder
MAF sensor contamination (it can cause a very lean condition)
TSB 99-06-04-005B contains a repair procedure for this code
TSB 03-06-04-030 contains a repair procedure for this code
　
P0301
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0107, P0108, P0116-P0118, P0121-P0123, P0125, P0336, P0341, P0502-P0503, P1106-P1107, P1114, P1115, P1121, P1122, P1336, 1351, P1361, P1362 and P1374 not set, engine speed from 525-6600 rpm, ECT sensor from 21-255ºF, TP angle steady, system voltage over 10.0v and the PCM detected a crankshaft speed variation in Cylinder 1 characteristic of a misfire.Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 1
Fuel delivery component fault that affects only Cylinder 1 (i.e., a contaminated, dirty or sticking fuel injector)
Ignition system problem (coil, plug) that affects only Cylinder 1
　
P0302
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0107, P0108, P0116-P0118, P0121-P0123, P0125, P0336, P0341, P0502-P0503, P1106-P1107, P1114, P1115, P1121, P1122, P1336, 1351, P1361, P1362 and P1374 not set, engine speed from 525-6600 rpm, ECT sensor from 21-255ºF, TP angle steady, system voltage over 10.0v and the PCM detected a crankshaft speed variation in Cylinder 2 characteristic of a misfire.Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 2
Fuel delivery component fault that affects only Cylinder 2 (i.e., a contaminated, dirty or sticking fuel injector)
Ignition system problem (coil, plug) that affects only Cylinder 2
　
P0303
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0107, P0108, P0116-P0118, P0121-P0123, P0125, P0336, P0341, P0502-P0503, P1106-P1107, P1114, P1115, P1121, P1122, P1336, 1351, P1361, P1362 and P1374 not set, engine speed from 525-6600 rpm, ECT sensor from 21-255ºF, TP angle steady, system voltage over 10.0v and the PCM detected a crankshaft speed variation in Cylinder 3 characteristic of a misfire. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 3
Fuel delivery component fault that affects only Cylinder 3 (i.e., a contaminated, dirty or sticking fuel injector)
Ignition system problem (coil, plug) that affects only Cylinder 3
　
P0304
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0107, P0108, P0116-P0118, P0121-P0123, P0125, P0336, P0341, P0502-P0503, P1106-P1107, P1114, P1115, P1121, P1122, P1336, 1351, P1361, P1362 and P1374 not set, engine speed from 525-6600 rpm, ECT sensor from 21-255ºF, TP angle steady, system voltage over 10.0v and the PCM detected a crankshaft speed variation in Cylinder 4 characteristic of a misfire.Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 4
Fuel delivery component fault that affects only Cylinder 4 (i.e., a contaminated, dirty or sticking fuel injector)
Ignition system problem (coil, plug) that affects only Cylinder 4
　
P0305
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0107, P0108, P0116-P0118, P0121-P0123, P0125, P0336, P0341, P0502-P0503, P1106-P1107, P1114, P1115, P1121, P1122, P1336, 1351, P1361, P1362 and P1374 not set, engine speed from 525-6600 rpm, ECT sensor from 21-255ºF, TP angle steady, system voltage over 10.0v and the PCM detected a crankshaft speed variation in Cylinder 5 characteristic of a misfire.Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 5
Fuel delivery component fault that affects only Cylinder 5 (i.e., a contaminated, dirty or sticking fuel injector)
Ignition system problem (coil, plug) that affects only Cylinder 5
　
P0306
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0107, P0108, P0116-P0118, P0121-P0123, P0125, P0336, P0341, P0502-P0503, P1106-P1107, P1114, P1115, P1121, P1122, P1336, 1351, P1361, P1362 and P1374 not set, engine speed from 525-6600 rpm, ECT sensor from 21-255ºF, TP angle steady, system voltage over 10.0v and the PCM detected a crankshaft speed variation in Cylinder 6 characteristic of a misfire.Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 6
Fuel delivery component fault that affects only Cylinder 6 (i.e., a contaminated, dirty or sticking fuel injector)
Ignition system problem (coil, plug) that affects only Cylinder 6
　
P0325
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0336, P0341, P0502, P0503, P1114, P1115, P1121 and P1336 are not set, engine speed from 1000-4000 rpm for 30 seconds, system voltage over 10.0v, ECT sensor more than 140ºF, TP angle from 3-15%, engine load from 20-45%, spark retard less than 15 degrees, and the PCM detected an unexpected voltage condition on the Knock sensor circuit.
Possible Causes:
Knock sensor signal circuit is open, shorted to ground or power
Knock sensor ground circuit is open (i.e., not mounted properly)
Knock sensor is damaged or has failed
On modules with an integrated sensor, clear the codes and retest for codes. If the same code resets, the PCM has failed.
　
P0332
Trouble Code Conditions:
DTC P0101-P0103, P0116-P0118, P0121-P0123, P0125, P0128, P0336, P0341, P0502, P0503, P1114, P1115, P1121 and P1336 not set, engine started, engine speed at 1000-4000 rpm for 30 seconds, system voltage over 10.0v, ECT sensor over 140ºF, TP angle from 3-15%, engine load 20-45%, spark retard less than 15 degrees, and the PCM detected an invalid voltage on the Knock sensor circuit.
Possible Causes:
Knock sensor signal circuit is open, shorted to ground or power
Knock sensor ground circuit is open (i.e., not mounted properly)
Knock sensor is damaged or has failed
On modules with an integrated sensor, clear the codes and retest for codes. If the same code resets, the PCM has failed.
　
　
P0336
Trouble Code Conditions:
Engine started; 3X REF signals detected, and the PCM did not detect any 18X pulses, or the ratio of 18X REF pulses to 3X REF pulses did not equal 6:1, or ratio of 3X REF pulses to CMP pulses equaled 6:1, conditions met for 290 of 300 samples. The Crankshaft Position Sensor (CKP) circuit uses two types of CKP sensors. CKP Sensor 'B' is connected directly to the ignition control module (ICM), while CKP sensor 'A' connects directly to the PCM.
Possible Causes:
CKP sensor signal circuit is open or shorted to ground
CKP sensor VREF circuit is open, or the ground (Low Reference) circuit is open
CKP sensor is damaged or it failed (check the crankshaft reluctor)
CKP sensor wiring routed close to spark plug wires (EMI/RFI)
PCM has failed
　
P0401
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0403, P0404, P0405, P0502, P0503, P0506, P0507, P0641, P0651, P1374, P1404 not set, engine started, ECT sensor more than 167ºF, IAT sensor from 32-212ºF, system voltage 11-18v, BARO sensor more than 74 kPa, IAC steady ( 5 counts), A/C Clutch and TR signals stable, then vehicle driven to over 50 mph at an engine speed of 1050-1300 rpm, MAP sensor from 15-70 kPa, followed by a deceleration period with the TP angle less than 1.3%, and the PCM detected the amount of MAP sensor change monitored with the valve open and then closed during deceleration indicated insufficient EGR flow. The EGR flow test is enabled by the PCM during deceleration. A change from 0 to a value over +0 in the Desired EGR and Actual EGR Position PID will appear on a Scan Tool. The PCM allows one EGR flow test in each key cycle. To verify a repair, the PCM will allow up to 12 EGR flow test counts during the first key cycle after codes are cleared. From 9-12 EGR flow tests are enough to detect adequate EGR flow.
Possible Causes:
Base engine problem (e.g., a severely restricted exhaust)
EGR vacuum hoses damaged, loose or routed incorrectly
EGR passages or intake passages clogged or restricted
EGR solenoid valve is clogged (carbon), damaged or has failed
TSB 87-65-22 contains a repair procedure for this code
P0403
Trouble Code Conditions:
Engine started; system voltage over 10.0v and the PCM detected an unexpected voltage condition on the EGR valve control circuit for over 20 seconds. The PCM controls the EGR valve with a solid-state device called a driver. The driver supplies the EGR solenoid with 12 volts that is pulsewidth modulated (PWM) signal through the EGR solenoid high control circuit. A ground path is provided by the PCM through the EGR solenoid low control circuit. If the PCM detects the driver has detected a circuit failure an EGR circuit, it sets this code.
Possible Causes:
EGR solenoid control circuit is open or shorted to ground
EGR solenoid control circuit is shorted to system power (B+)
EGR solenoid high control (VREF) circuit is open
EGR solenoid is damaged or has failed
PCM has failed

P0404
Trouble Code Conditions:
Engine started; system voltage over 10.0v, EGR valve commanded open, and the PCM detected the difference between the Actual EGR position and the Desired EGR position was more than 15% for 20 seconds during the CCM test period.
Possible Causes:
EGR sensor signal circuit is open, shorted to ground or power
EGR sensor ground or VREF circuit is open
EGR valve seat or pintle contains debris or plugged with carbon
PCM has failed
　
P0405
Trouble Code Conditions:
Key on or engine running; system voltage at 10-16v, and the PCM detected that the Actual EGR (feedback) sensor signal was less than 0.14v, conditions et for over 20 seconds during the test period.
Possible Causes:
EGR position sensor signal circuit is open
EGR position sensor signal circuit is shorted to ground
EGR position sensor VREF circuit is open or shorted to ground
EGR position sensor is damaged or has failed
PCM has failed
TSB 99-06-04-45 contains a repair procedure for this code