P0615: How to Diagnose & Fix — Starter Relay Circuit
2 vehicles · 1 makes · $150-$900 repair
How to diagnose and fix P0615: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Nissan Pathfinder · 2022–2025
Multiple owners reported the Pathfinder shutting off at a stop with the auto start-stop system and then failing to restart promptly, sometimes displaying warning messages or requiring a manual restart attempt. NHTSA lists no Pathfinder safety recall for the idle stop/start system, but owners describe the engine failing to restart or stalling after an auto stop event, which can leave the vehicle stopped in traffic and increase crash risk. Complaints often describe the issue occurring at traffic lights or in heavy traffic, with the vehicle briefly immobilized.
Common Symptoms
- engine shuts off at stop and does not restart immediately
- stall warning or malfunction message
- vehicle stuck in traffic after auto stop
- long crank after start-stop event
- battery warning or multiple warning lights
How to Fix
The primary fix is to have a dealer check for applicable TCM/ECM software bulletins (for example NTB21-109 for DTC P0805 with an Idle Stop System Fault message on early-build 2022 models) and reprogram if applicable. If the problem persists, technicians should load-test the 12V battery, inspect the intelligent battery sensor and charging system, and scan for start-stop related faults because low system voltage can aggravate restart failures. Owners often disable start-stop temporarily until the cause is repaired.
Owner tips & cautions
- TipIf restart behavior is weak or inconsistent, have the battery tested even on newer vehicles because low voltage can trigger multiple false warnings.
Sources for this issue (2)
Nissan Frontier · 2022–2024
Owners of the new-generation Frontier have reported intermittent no-start events, extended crank, or occasional stalling tied to control-module logic, battery state sensitivity, or software calibration issues. Complaints commonly describe the truck acting like a weak battery or failing to restart normally despite the battery testing good. Nissan has issued service information and software-related fixes for some starting and drivability complaints on this platform.
Common Symptoms
- Intermittent no-start
- Extended cranking
- Truck starts after multiple attempts
- Random stall or restart issue
- Battery tests good but symptoms persist
How to Fix
Begin with battery load testing, charging-system verification, and a scan for stored or pending codes in the ECM, BCM, and IPDM. If hardware checks out, dealers typically look for applicable ECM/TCM/BCM software updates and reprogram as needed. Poor battery condition or loose grounds should be corrected before module updates are performed.
Owner tips & cautions
- TipHave the battery tested with a real load tester, not just voltage checked; many owners found weak OE batteries caused confusing electronic symptoms.
Sources for this issue (1)
Find P0615 by make
Browse every documented model and issue for your make.
P0615 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0615 mean?
P0615 stands for "Starter Relay Circuit." This code means the engine/powertrain computer detected a fault (open, short, or unexpected voltage) in the starter relay control circuit, which the module uses to energize the starter relay and crank the engine. On vehicles with computer-controlled or push-button start, this circuit is part of the path that allows the engine to be started. A fault here can cause intermittent or no-crank/no-start conditions, so it is worth diagnosing even though it does not affect a running engine.
What are the most common causes of P0615?
The most common causes of P0615 are: Faulty starter relay, Damaged, corroded, or loose wiring/connectors in the relay circuit, Open or shorted control wire to the relay, Corroded relay socket or fuse box terminals, Blown fuse in the starter control circuit, PCM/ECM driver fault (rare). The specific cause varies by vehicle.
How much does it cost to fix P0615?
Repair costs for P0615 range from $150 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P0615?
Au7o has documented P0615 across 2 vehicle models from 1 manufacturers: Nissan.
Join 600+ people using Au7o to better understand their vehicles.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.