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Vehicle engine and/or automatic transmission

Code: P2135 - The Throttle/Pedal Position Sensors (TPS) "A" and "B" are giving mismatched voltage signals, which may affect how your accelerator responds.

Let me break down what the P2135 code really means from a technician’s point of view. When you see this one pop up, your car’s computer is basically telling you there’s a disagreement between the signals coming from the throttle position sensors and the accelerator pedal position sensors. You press the gas pedal expecting the throttle plate to open just right, but if those sensors aren’t in sync, the computer senses trouble and immediately throws this code. We’re dealing with what’s called electronic throttle control-sometimes folks call it 'throttle by wire.' Gone are the days of the old throttle cable; now it’s all sensors and an electric motor doing the work. There are at least two sensors on the pedal and two more on the throttle body, constantly cross-checking each other. If just one pair falls out of line, the computer kicks in to limit power, trying to keep you out of a dangerous situation. I’ve seen this system save folks from some real headaches, but when it goes wrong, you’ll know it.

Causes of P2135 engine code

If you’re chasing down a p2135 gmc problem, let me tell you-these are the usual suspects I run into in the shop:

Accelerator pedal position sensor assembly that’s gone bad
Throttle position sensor failure right on the throttle body
Wiring issues-think frayed wires, loose or dirty connectors, or corrosion anywhere between those sensors and the computer
PCM problems, like outdated software or even internal failure (not common, but I’ve seen it happen)

Honestly, nine times out of ten, it’s either a sensor or a wiring issue. Still, I never assume-every step gets checked before replacing parts.

Symptoms of P2135 code

When your car throws a P2135, you won’t have to look hard to spot trouble. The check engine light will light up, and you might notice your ride suddenly feels gutless-sometimes it’ll only idle or jump right into 'limp mode,' where pushing the pedal barely does a thing. I’ve even seen engines stall or quit in the middle of traffic, which is enough to make anyone’s heart skip a beat. If you’re seeing these symptoms, don’t just keep driving and hope it’ll clear up. This isn’t limited to just one brand, either; I’ve dealt with it on Chevrolets, Nissans, and plenty of others.

Diagnosis steps for dtc P2135

If you’re staring down a dtc p2135 nissan, here’s the process I follow to get to the bottom of it:

First thing, I always check for any other trouble codes-sometimes there’s more going on than just P2135.
Next, I pop the hood and do a careful visual on all the wiring and connectors at the throttle body and pedal. I’m looking for anything out of place: broken wires, loose plugs, green corrosion. Pro-tip-have someone slowly press the gas pedal while you watch for any weird movement or flicker at the connections.
Then it’s time for the scan tool. I pull up live data from both the pedal and throttle sensors and slowly work the pedal, making sure the readings match and move smoothly. If one sensor lags, jumps, or just stays flat, you’ve found your problem area.
After that, I’ll check for Technical Service Bulletins (TSBs) for that specific make and model. Sometimes a software update is all it takes, and you’d never know without looking it up.
If all that checks out, I’ll break out the multimeter and test the sensors directly to make sure they’re within spec. Find a bad one? Replace it, clear the code, and see if it comes back.

One thing I always do-disconnect the battery before unplugging any sensors. You don’t want to fry anything by accident.

Common mistakes when fixing P2135 trouble code

A classic mistake I see, especially with chevy cruze p2135 issues, is folks swapping out the throttle body or pedal assembly right away without ever checking the wiring. That can get expensive, fast. Another one? Overlooking possible TSBs or software updates-sometimes the fix is just a quick reflash at the dealer. And I can’t count how many times a loose or dirty connector has been the real culprit. Skipping those basic checks leads to wasted time, money, and a lot of frustration.

Seriousness of P2135

You really can’t afford to ignore a P2135. When your car’s in Reduced Power Mode, you could lose acceleration just when you need it most-merging, turning, or crossing busy streets. It’s flat-out unsafe to let this slide. I’ve seen folks get stranded, or worse, put in a dangerous spot because they put off the repair. Plus, if you keep driving with this issue, it can put extra strain on the throttle body motor and might even knock out your PCM or wiring harness. I’ve seen the same thing play out in gm p2135 cases, too.

Repair recommendations for obd2 code P2135

When it comes to fixing this, here’s what usually gets the job done:

Swap out a faulty throttle position sensor or accelerator pedal position sensor assembly
Repair or replace any damaged wiring or connectors you find
If there’s a known software issue, update the PCM
Rarely, you might need to replace the PCM itself

My advice? Start with the basics-inspect and repair any wiring or connectors before you go buying sensors. Always go with OEM parts and follow the repair manual for your car. That’s the best way to make sure the fix sticks.

Conclusion

If you’re seeing a P2135, your car’s computer is warning you that the throttle and pedal sensors just aren’t on speaking terms. This isn’t something to put off-it can really mess with your ability to drive safely. Start with a good look at the wiring and connectors, check for software updates or TSBs, and only swap sensors or the PCM after you’ve ruled out the basics. Take care of it quickly and you’ll save yourself a world of trouble down the road.

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