Car will not start 2008 Pontiac Grand Prix V6 135,000 miles

Asked by Jul 11, 2016 at 08:26 PM about the 2008 Pontiac Grand Prix Base

Question type: Maintenance & Repair

Saturday Mechanic Needs advice please
Coolant was leaking into unknown area of engine, no white exhaust, no milky oil. Replaced about 2 quarts of water every 4 days or so. Removed and replaced Lower and Upper (plenum) gaskets. Installed new thermostat, refilled with new Dex-coolant, bled system. Engine ran fine for several days. No coolant leaks. Then Engine light came on and codes P2138 and P1125 appeared on code scanner. Seems to direct to Throttle Position sensor. I am concerned that wires (harness) to TPS might have become frayed while wrestling to remove and replace both manifolds. At any rate, car just died at intersection. Battery is good, lights, horn etc. But no activity from starter. Any thoughts are appreciated.

4 Answers


You said the wiring harness frayed, so you might have a short to ground.

I said Might be frayed. Not able to see thru harness or connector.


Then its highly unlikely its frayed. I would look for a bad connection somewhere and follow up on your trouble codes.

2 of 2 people found this helpful.

Checked codes once more after stall and no crank no start condition: P0068, P0113, P0102, P1125, P2125, P2138, P0068 and P0106.

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