P0615
UniversalThe Powertrain Control Module (PCM) detects an incorrect voltage reading or an open/short in the starter relay control circuit.
High SeverityThe Powertrain Control Module (PCM) has detected a malfunction within the starter relay circuit, which is responsible for sending power to the starter motor. This issue will prevent the engine from cranking or starting, leaving the vehicle inoperable.
⚠️ Before You Begin (Safety First)
Always disconnect the battery before working on electrical components, especially those related to the starter, to prevent accidental starts or electrical shorts. Ensure the vehicle is in Park/Neutral with the parking brake engaged.
Common Symptoms
- Engine does not crank or start
- Engine cranks slowly but doesn't start
- Clicking sound when trying to start
- Check Engine Light (CEL) illuminated
- No power to starter
Common Causes
- Faulty starter relay
- Corroded or loose electrical connections at the starter relay or starter
- Open or short in the starter relay control circuit wiring
- Blown fuse related to the starter circuit
- Faulty ignition switch
- Internal PCM fault (rare)
Frequently reported on: Chrysler 300 (2005-2010), Dodge Ram 1500 (2002-2008), Ford F-150 (2004-2008)
Diagnostic Steps
- Check for blown fuses related to the starter or ignition system.
- Locate the starter relay in the fuse box (usually under the hood or dash).
- Swap the starter relay with a known good, identical relay from another non-critical circuit (e.g., horn, fog lights) to test it.
- Inspect the wiring and connectors around the starter relay and starter motor for signs of corrosion, damage, or looseness.
- If accessible, check battery voltage at the starter motor while someone attempts to crank the engine (use caution and appropriate safety measures).
👨🔧 When to Call a Professional
If after basic checks (fuse, relay swap) the problem persists, or if you suspect a wiring harness issue, call a professional technician for proper diagnostic and repair to avoid further electrical damage.
Commonly Asked Questions
Can a bad battery cause a P0615 code?
No, a P0615 specifically points to an issue with the starter relay circuit itself, not necessarily the battery's charge. However, a dead battery will also prevent starting.
Where is the starter relay located?
The starter relay is typically found in the under-hood fuse box or sometimes in an auxiliary fuse box under the dashboard. Consult your vehicle's owner's manual for its exact location.
Is it safe to drive with a P0615 code?
No, a P0615 code usually means your vehicle will not start or crank, making it impossible to drive.
How can I test the starter relay?
You can test a starter relay by swapping it with an identical, known-good relay from another non-critical circuit in your fuse box, or by using a multimeter to check for continuity and proper operation when power is applied.
What if replacing the starter relay doesn't fix it?
If replacing the relay doesn't work, the issue likely lies with the wiring (open/short circuit) leading to or from the relay, or potentially the ignition switch or PCM, requiring more in-depth electrical diagnosis.