Question about 2005 Pontiac Grand Prix
There is a GM service bulletin on this particular item. basically covers both codes your getting.
#07-06-04-019A: Intermittent MIL/SES, DTC P2138 with Reduced Engine Power (Repair Instrument Panel (IP) to Body Harness Connector)
Models: 2005-2008 GM Passenger Cars and Light Duty Trucks (Including Saturn)
Posted on Jul 03, 2009
2005 GRAND PRIX IT SHUTS OFF WHEN TAKEN OF FAST (REDUCE ENGINE POWER) ???????
Posted on Jun 26, 2011
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Posted on Jan 02, 2017
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The transmission of
a vehicle which has suffered a transmission problem will
send the P0700 code to the vehicle engine control module (ECM)
P0705 Transmission Range Sensor Circuit Malfunction
- Open or short park/neutral position switch circuit
- Poor park/neutral position switch circuit connection
- Misadjusted park/neutral position switch
- Park/neutral position switch may be faulty
P0455. A code p0455 most likely means one or more of the
following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system
P1125 Accelerator Pedal Position (APP) System
P2125 Throttle/Pedal Position Sensor/Switch "E"
P2138 Throttle possition sensor
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