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P0120 Diagnostic Trouble Code Discussion for June 2010

Throttle Position Sensor Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0120
Help Request Posted
2001 Mercedes-Benz C320 3.2L Poor Idle Quality, Hesitation, Surge, MIL Lamp on, idles too high VIN: WDBRF64J21
P0120: tps. This car has had this problem for a while and, the customer has been doing his own trouble shooting and after replacing a bunch of expensive parts he gave up and brought it to me. the only code I have gotten so far is a P2004/P0100 maf senosor. MAF readings ar...
June 14, 2010
2003 GMC W4500 Forward W4S042 6.0L MIL Lamp on VIN: 4KDB4B1U83
P0120: PCM detects that the TP sensor 1 signal or TP sensor 5-volt reference voltage is outside the predetermined range this DTC sets. Vehicle came in with P0120 and P2135. Previously worked on by another shop and throttle body assm. replaced. I only found codes in system never could duplicate fault or see anything on scanner, voltmeter or scope. Warrantied T/B assm. through local dealer and ...
June 28, 2010