Thread: Help please reduced engine power p2135 and p0122

So got this today and need my car, I can pull battery and code will disapeer but comes back about a block or two from the house. And what I can tell it does it at a certain point In the throttle position so please help anyone

A P0122 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too low a voltage. On some vehicles that lower limit is 0.17 - 0.20 volts (V).

DTC P0122

CIRCUIT DESCRIPTION
The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies each TP sensor with a 5-volt reference circuit, a low reference circuit, and a signal circuit.

The TP sensors have opposite functionality. TP sensor 1 signal voltage decreases from above 4 volts at idle to below 1 volt at wide open throttle (WOT). TP sensor 2 signal voltage increases from below 1 volt at idle to above 4 volts at WOT.

If the ECM detects TP sensor 1 signal voltage is too low, this DTC sets.

DTC P2135

CIRCUIT DESCRIPTION
The throttle position (TP) sensors 1 and 2 are located within the throttle body assembly. The TP sensors share a common 5-volt reference circuit and a common low reference circuit. The 5-volt reference circuit is also shared with the accelerator pedal position (APP) sensor 2. The 5-volt reference voltage is supplied on 2 separate engine control module (ECM) terminals, but the terminals are connected internally to the same voltage supply. Each TP sensor has an individual signal circuit, which provides the ECM with a signal voltage proportional to throttle the plate movement. When the throttle plate is in the closed position, the TP sensor 1 signal voltage is near the low reference and increases as the throttle plate is opened. The TP sensor 2 signal voltage at closed throttle is near the 5-volt reference and decreases as the throttle plate is opened. If the ECM detects that the TP sensors are not within a predicted value from each other, DTC P2135 sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P2135 Throttle Position (TP) Sensor 1-2 Correlation

CONDITIONS FOR RUNNING THE DTC

• DTCs P0122, P0123, P0222, P0223, P0601, P0602, P0603, P0604, P0606, P0607, P0641, P0651 are not set.
• The ignition is ON.
• DTC P2135 runs continuously when the above condition is met.

CONDITIONS FOR SETTING THE DTC
The ECM detects that the difference between TP sensor 1 and TP sensor 2 is more than the predicted value for less than 1 second .

ACTION TAKEN WHEN THE DTC SETS

• The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
• The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records.
• The control module commands the TAC system to operate in the Reduced Engine Power mode.
• A message center or an indicator displays Reduced Engine Power.
• Under certain conditions the control module commands the engine OFF.

CONDITIONS FOR CLEARING THE MIL/DTC

• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
• Clear the MIL and the DTC with a scan tool.

I read the service manual already and damn it's always electrical with this car

So why'd you ask?

Looks like its eaither the APP sensor or the Throttle body itself.

Correction it was chaffing wires by PCM from air filter cone sagging.