Pinpoint Test K: U3008:13

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to TRAILER/CAMPER ADAPTER for schematic and connector information.

Normal Operation and Fault Conditions

The TRM receives battery voltage from BCMC fuse 42 (30A). The TRM has a single ground circuit. An open circuit in the wiring or a condition resulting in an open in the ground circuit, such as an internal failure of the TRM or a connector concern, results in the TRM setting this DTC. When this DTC sets, the TRM disables trailer braking and sends a TBC FAULT message to the message center. If a trailer is not connected to the vehicle when this DTC sets, the TRM sends a TRAILER BRAKE MODULE FAULT message to the message center.

REFER to: Auxiliary Brake System - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
TBM U3008:13	Control Module Ground "A": Circuit Open	This DTC sets in continuous memory and on-demand when the TRM detects a rise in battery voltage greater than 19 volts during a braking event and while not braking, the battery voltage rises greater than 0.75 volt after sending the PWM trailer connectivity test pulse.

Possible Sources

Wiring, terminals or connectors
TRM

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

K1 CHECK THE TRM (TRAILER MODULE) GROUND CIRCUIT FOR AN OPEN

NOTE: The TRM is a combined TBM and Trailer Lighting Module.

Ignition OFF.

Disconnect TRM C2498C.

Disconnect the battery negative cable. REFER to: Battery Disconnect and Connect .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2498F-12	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to K2

No	LOCATE and INSPECT the ground circuit eyelet. Refer to TRAILER/CAMPER ADAPTER for schematic and connector information. DISCONNECT and CLEAN the ground circuit eyelet as necessary. If the ground circuit eyelet is OK, REPAIR the circuit.

K2 CHECK FOR CORRECT TRM (TRAILER MODULE) OPERATION

Using a good light source, inspect TRM C2498C for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary

Connect TRM C2498C, make sure it seats and latches correctly.

Connect the battery negative cable (if previously disconnected). REFER to: Battery Disconnect and Connect .

Operate the system and verify 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 TRM module. REFER to: Trailer Module (TRM) .

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.