Question about 2001 Pontiac Firebird

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2001 firebird that has low engine power, which is intermittent and throws out a code 1518.

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  • Pontiac Master
  • 1,250 Answers

Code P1518 is .... no communication between electronic throttle module and PCM

Posted on Oct 12, 2013

  • 1 more comment 
  • Connie Wolf
    Connie Wolf Oct 13, 2013

    Dear Denis my son has been working on the car and always has made it run but this time the low enging light comes on and runs intermittently and he says he ran check on voltage.

  • Denis Houle
    Denis Houle Oct 13, 2013

    I think it is not the pcm or TAC module, the problem is electrical .there is no communication between tac and pcm, what it means the signal could short to ground, you have 5 volts reference , a reference to 0volts could mean is at ground it could be complicated if you don't have electrical knowledge

  • Denis Houle
    Denis Houle Oct 13, 2013

    one more thing uart is a communication circuit ,there is two commmunication wires unplug pcm and tac (throttle actuator control) and check those two wire if they are short to ground , if yes find out where or place two new wire.

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Posted on Jan 02, 2017

redbeard00
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SOURCE: engine codes p1518, p0125, and p0420 for 2001 firebird

P0125 sets when engine coolant temp does not reach temperature for closed loop operation within a set amount of time.
May be a faulty sensor or thermostat.
P0420 Is related to a faulty rear 02sensor.
P1518 PCM & TAC module communication detected missing or invalid serial data.
If TAC related repair has been done, clear DTC & recheck system. It may be necessary to preform clear codes function twice to clear this DTC.
make sure starting system & charging system are functioning properly. Low voltage can cause this DTC to set. This should help. Let me know how its going.

Posted on Apr 27, 2010

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