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Captain
Posts: 123
Registered: ‎10-21-2015

Re: Code 12 but TPS is okay

Code 12 means that the voltage between the TPS wiper signal and ground is <0.14V or > 4.92 V.  While a fault with the +5 analog voltage could induce this code, if there was an issue with the analog 5, other sensor faults would likely occur at the same time.

 

My best guess is the TPS signal lead is intermittently shorting to ground somewhere in the engine wiring harness.  The short drives the wiper voltage to less than 0.14 V and hence the code 12.