Starter Request Circuit Malfunction
The P0512 code indicates a fault in the starter request circuit, which is the electrical path that carries the start signal from the ignition switch or start button to the powertrain control module (PCM). When the PCM detects an unexpected voltage or signal from this circuit, it sets this code. This can prevent the engine from cranking or starting, and may be caused by a faulty ignition switch, a defective starter relay, wiring issues, or a failed PCM.
1. Most Common Causes
- Faulty ignition switch or start button
- Open or shorted wiring in the starter request circuit
- Defective starter relay
- Corroded or loose electrical connectors
- Failed powertrain control module (PCM)
2. Symptoms You Will Notice
- Engine cranks but does not start
- Engine does not crank at all
- Intermittent starting issues
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Inspect the starter request circuit wiring and connectors for damage, corrosion, or looseness.
Step 3: Test the ignition switch or start button for proper operation using a multimeter.
Step 4: Check the starter relay and its control circuit for continuity and voltage.
Step 5: If all else is normal, test the PCM input/output for the starter request signal.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe because the vehicle may not start or may stall unexpectedly, leaving you stranded.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the root cause and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.