Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test K: U3003:17
- Refer to POWER DISTRIBUTION
for schematic and connector information.
Normal Operation and Fault Conditions
The BCMC receives voltage at all times from the BJB.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition BCMC U3003:17 Battery Voltage: Circuit Voltage Above Threshold A continuous and on-demand DTC that sets in the BCMC when the BCMC detects higher than expected battery voltage on the voltage supply input circuit. Possible Sources
- Charging system concern
- BCMC (BJB)
- NOTE: U3003:17 may be stored in the module memory due to previous battery charging or vehicle jump starting events.
- K1 CHECK FOR OVERCHARGING DIAGNOSTIC TROUBLE CODES (DTCS) SET IN OTHER MODULES
- Ignition ON.
- Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Are any charging system Diagnostic Trouble Codes (DTCs) recorded?
Yes DIAGNOSE the charging system concern. REFER to the appropriate Battery and Charging article for procedure . No GO to K2 - K2 CHECK THE BATTERY VOLTAGE
- Turn off all interior/exterior lights and accessories.
- Start and run the engine at approximately 2, 000 rpm for three minutes while monitoring the battery voltage.
Positive Lead Measurement / Action Negative Lead
Does the battery voltage rise to 16 volts or higher?
Yes DIAGNOSE the over-charging system concern. REFER to the appropriate Battery and Charging article for procedure . No GO to K3 - K3 RECHECK THE BCMC (BODY CONTROL MODULE C) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Wait 10 seconds.
- Using a diagnostic scan tool, check the BCMC Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Is DTC U3003:17 still present?
Yes GO to K4 No The system is operating correctly at this time. The DTC may have been caused by module connections or may have been set previously during battery charging or while jump starting the vehicle. ADDRESS the root cause of any connector or pin issues. - K4 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION
- Disconnect and inspect the BCMC connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCMC connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC. REFER to: Body Control Module C (BCMC) . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.