Starter Request Circuit
The P0512 code means the vehicle's onboard diagnostic system has detected: Starter Request Circuit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $500 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Vehicle may not start
- Intermittent starting issues
- Start/stop system malfunction
Probable Causes (Ranked by Likelihood)
- Faulty starter relay or starter motor Very High
- Wiring issue in starter request circuit High
- Ignition switch or start button malfunction Moderate
- ECM starter control driver failure Low
Step-by-Step Diagnostic Procedure
-
Verify voltage reaches the starter solenoid when the ignition key is turned to start position
-
Test the starter relay by swapping with a similar relay; listen for a click when the key is turned
-
Check the ignition switch or start button circuit for proper voltage output
-
Inspect the starter motor and solenoid wiring for corrosion or loose connections
Frequently Asked Questions
What is the starter request circuit?
The starter request circuit is the signal path from the ignition switch or push-button start to the ECM. The ECM then authorizes and commands the starter motor to engage. This circuit allows the ECM to control starter operation based on engine conditions.
Can P0512 prevent my car from starting?
Yes. If the starter request signal is not reaching the ECM or the ECM cannot properly command the starter, the vehicle may crank intermittently or not at all.
Is P0512 related to the start/stop system?
Yes. Vehicles with automatic start/stop systems rely on the starter request circuit to restart the engine. P0512 can cause the start/stop system to become disabled, keeping the engine running at stops.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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