Ultimate Trouble code guide

**kyleinkman** · 09-17-2011

Here guys I put together a one stop spot for learning about your error codes enjoy!

P0101
Trouble Code Conditions:
DTC P0102, P0103, P0106, P0107, P0108, P0121, P0122, P0123, P0401, P0404, P0405, P0440, P0442, P0446, P1404 or P1441 not set, engine started, system voltage at 9-18v, TP angle under 15% ( 5%), MAP signal under 80 kPa ( 5 kPa), Traction Control off, Purge command below 50%, and the PCM detected the MAF signal did not agree with calculated MAF value for a period of 5 to 40 seconds.

Possible Causes:

Base engine vacuum leak, PCV valve leaking or stuck open
Engine oil dipstick missing or not fully seated
MAF sensor signal or ground circuit fault or sensor has failed
PCM has failed

P0102
Trouble Code Conditions:
Engine started, system voltage from 10-18v, IAC motor more than 2 counts, and the PCM detected the MAF sensor frequency was less than 1,200 Hz, condition met for 1 second.

Possible Causes:

MAF sensor element hot wire contaminated or the sensor failed
MAF sensor signal shorted to ground or ground circuit problem
MAF sensor wiring routed close to the ignition wires, generator, solenoids or electric motors
PCM has failed

P0131
Trouble Code Conditions:
DTC P0101-P0103, P0106-P0108, P0112-P0113, P0116-P0118, P0121-P0123, P0125, P0128, P0201-P0206, P0410, P0440, P0442, P0443, P0446, P0449 and P1441 not set, engine started, TP angle from 5-40%, and the PCM detected the HO2S signal was less than 175 mv for 45 seconds, or less than 600 mv for 55 seconds while operating in P/E mode during the test. The HO2S is used for fuel control and post-catalyst monitoring. This sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. At initial startup, the PCM operates in open loop mode, ignoring the HO2S signal when calculating the air/fuel ratio. The PCM supplies the HO2S with a reference (or bias) voltage of about 450 mv. The HO2S generates a voltage within a range of 0-1000 mv that fluctuates above and below the bias voltage once in closed loop. A high HO2S voltage indicates a rich fuel mixture. A low HO2S voltage indicates a lean mixture. Heating elements in the HO2S shorten the time required for the sensor to reach normal temperature, and an accurate voltage signal.

Possible Causes:

Air leaks in the exhaust system, intake manifold, vacuum lines
Engine misfire condition present (look for P0300 series codes)
Fuel system too lean (possible low fuel pressure, water in fuel)
HO2S signal circuit is shorted to the sensor or chassis ground
HO2S is damaged (i.e., cracked) or air reference hole clogged
PCM has failed

P1032
Trouble Code Conditions:
DTC P0101-P0103, P0106-P0108, P0112-P0118, P0121-P0123, P0125, P0128, P0201-P0206, P0410, P0440-P0449 and P1441 not set, engine started, engine running with the TP angle from 5-40% in closed loop, and the PCM detected the HO2S signal was more than 975 mv, or it was more than 200 mv for 55 seconds in DFCO mode.

Possible Causes:

Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
HO2S element is silicon, water or fuel contaminated
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
PCM has failed

P0133
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201 P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 and P1441 not set, engine started, engine speed from 1000-3000 rpm in closed loop for 1 minute, ECT sensor more than 122ºF, MAF sensor from 13-32 g/s, and the PCM detected the average HO2S rich-lean response time was over 145 ms or the average lean-rich response time was over 135 ms.

Possible Causes:

Exhaust leak present in the exhaust manifold or exhaust pipes
Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
HO2S element is silicon, water or fuel contaminated or it failed
TP sensor element broken (can cause false acceleration event)
PCM has failed

P1034
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201 P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 and P1441 not set, engine started, engine runtime over 200 seconds, and the PCM detected the HO2S signal was fixed between 400-500 mv for over 30 seconds.
Possible Causes:
HO2S heater is damaged or has failed
HO2S signal or ground circuit has a high resistance condition
HO2S signal circuit is open or shorted to system power (B+)
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
PCM has failed

P1035
Trouble Code Conditions:
DTC P0101-P0103, P0106-P0108, P0112, P0113, P0116-P0118, P0121-P0123, P0125, P0128, P0201-P0206, P0410, P0440, P0442, P0443, P0446, P0449 and P1441 not set, IAT and ECT sensors with 11ºF of each other at startup, MAF sensor less than 17-20 g/sec, HO2S signal within 100 mv of bias voltage at startup, and the PCM detected the HO2S signal remained within 150 mv of bias voltage (450 mv) for 50-80 seconds (depends on ECT and MAF at startup).
Possible Causes:
HO2S heater ground circuit is open or has high resistance
HO2S heater power circuit is open (test O2S fuse in fuse block)
HO2S heater element is damaged or has failed
PCM has failed

P0137
Trouble Code Conditions:
DTC P0101-P0103, P0106-P0108, P0112-P0113, P0116-P0118, P0121-P0123, P0125, P0128, P0201-P0206, P0410, P0440, P0442, P0443, P0446, P0449 and P1441 not set, engine started, TP angle from 5-40%, and the PCM detected the HO2S signal was less than 30 mv for 45 seconds, or was less than 600 mv for 100 ms while operating in P/E mode during the test.

Possible Causes:

Air leaks in the exhaust system, intake manifold, vacuum lines
Engine misfire condition present (look for P0300 series codes)
Fuel system too lean (possible low fuel pressure, water in fuel)
HO2S signal circuit is shorted to the sensor or chassis ground
HO2S is damaged (i.e., cracked) or air reference hole clogged
PCM has failed

P0138
Trouble Code Conditions:
DTC P0101-P0103, P0106-P0108, P0112-P0118, P0121-P0123, P0125, P0128, P0201-P0206, P0410, P0440-P0449 and P1441 not set, engine running in closed loop, TP angle from 3-40%, and the PCM detected the HO2S signal was more than 975 mv for 55 seconds, or that it was more than 200 mv while operating in DFCO mode.

Possible Causes:

Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
HO2S element is silicon, water or fuel contaminated
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
PCM has failed

P0140
Trouble Code Conditions:
DTC P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201 P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 and P1441 not set, engine started, engine runtime over 200 seconds, and the PCM detected the HO2S signal was fixed between 400-500 mv for over 240 seconds.

Possible Causes:

Exhaust leak present in the exhaust manifold or exhaust pipes
HO2S signal or ground circuit has a high resistance condition
HO2S element is silicon, water or fuel contaminated
PCM has failed

P0141
Trouble Code Conditions:
DTC P0101-P0103, P0106-P0108, P0112, P0113, P0116-P0118, P0121-P0123, P0125, P0128, P0201-P0206, P0410, P0440, P0442, P0443, P0446, P0449 and P1441 not set, IAT and ECT sensors with 11ºF of each other at startup, MAF sensor less than 17-20 g/sec, HO2S signal within 100 mv of bias voltage at startup, and the PCM detected the HO2S signal remained within 150 mv of bias voltage (450 mv) for 50-80 seconds (depends on the ECT/MAF at startup).

Possible Causes:

HO2S heater ground circuit is open or has high resistance
HO2S heater power circuit is open (test O2 fuse in fuse block)
HO2S heater element is damaged or has failed
PCM has failed

P0171
Trouble Code Conditions:
DTC P0101-P0103, P0107, P0108, P0121-P0123, P0130-P0138, P0140, P0141, P0201-P0206, P0300, P0401-P0405, P0410, P0440-P0446, P0506, P0507, P1404 or P1441 not set, engine started, vehicle driven at less than 82 mph at 550-4000 rpm, BARO sensor over 70 kPa (10.1 psi), ECT sensor from 68-230ºF, IAT sensor from 64-158ºF, MAF sensor from 2.8-150 gm/s, MAP sensor from 16-105 kPa (2.6-15.2 psi), fuel level over 10%, and the PCM detected the Long Term fuel trim value was more than +20% for 6 seconds. The PCM controls the air/fuel metering system to good overall fuel economy, driveability, and emission control. During open loop, the PCM determines fuel delivery based on sensor signals, without the oxygen sensor input. During closed loop, the PCM adds oxygen sensor inputs to calculate Short and Long term fuel trim fuel delivery adjustments. Short Term fuel trim values change rapidly in response to changes in the oxygen sensor signals. Long Term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1.

Possible Causes: