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Pontiac of the Month

4 bucket 67's 1967 GTO

2023 December
of the Month

08 wave missing Please hep

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So my 2008 pontiac wave is missing and sometimes staling while ide. It ony misses or surges when it's hot, it will work perfectly when it's cold. After about 15 min of driving the problem starts. It was giving codes p2135(throttle position sensor) and p0340(crankshaft position sensor) Both sensors were replaced as we as the throttlebody. All new parts. But the problem persists. However the codes are gone. No codes are showing now. So obviously that wasn't causing the issue. Also changed the plugs and wires which also did nothing. 

The engine wont miss if it's in park or neutral, it's nice and smooth.I can step on the gas as much as i want with no miss.There is some oil in the spark plugs but it's been there for years and never caused any issues. When i got the car the seal on top of engine was bad and leaking oil which i replaced(no oil leaking now). I can't see that causing a problem now all of a sudden. My battery is bad which my mechanic says could cause issues if it wont accept the proper voltage from the alternator but why would it only cause issues when it's warm? I can't see that being the problem.

Any ideas?

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I think the description from engine-codes.com is somewhat self-explanatory as far as answering your immediate question. You may have a paid accelerator pedal position sensor. 

P2135 OBD-II CODE     

Possible causes

Faulty electric throttle control actuator (TP sensor 1 and 2)

Throttle Position Sensor harness is open or shorted

Throttle Position Sensor circuit poor connection

Faulty accelerator pedal position sensor


Possible symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P2135  Description

The throttle Position (TP) sensors 1 and 2 are potentiometer type sensors each with 3 circuits.

- A 5 - volt reference circuit.

- A low reference circuit.

- A signal circuit

The TP sensors are used to determine the throttle plate angle for various engine management systems. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module with signal voltage proportional to the throttle plate movement. Both TP sensors signal voltage are low at the close throttle and increase as the throttle opens. When the control module detects that the TP sensor 1 signal and TP sensor 2 signals disagree or the signal voltages are outside the predetermined range, the P2135 code is set.


As far as your battery question goes, today's cars battery and alternators can affect one another. I've had a faulty alternator literally destroy both a starter and battery on my old S10 Blazer. I've had an intermittent (weak cell) battery give inconsistent voltage to the alternator, which eventually cause the diode in the alternator to fail. So a health battery and a health alternator are good things for your car period.

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