Dodge B162C indicates a high-voltage condition in the left low beam headlamp control circuit — most often caused by a wiring short to voltage, a faulty TIPM (Totally Integrated Power Module) output, or a failed headlamp control module, depending on the model and lighting architecture.
What B162C means
B162C is a manufacturer-specific body code in Dodge vehicles (Charger, Challenger, RAM pickups, Durango) indicating the body control system has detected abnormally high voltage on the left low beam headlamp circuit. On most Dodge and Chrysler FCA/Stellantis products from 2007 onward, exterior lighting control passes through the TIPM (Totally Integrated Power Module), a consolidated unit that handles fuse, relay, and smart body control functions. When the TIPM's driver circuit or a transistorised output for the left low beam detects a voltage reading above its expected range — due to a wiring short to battery positive, a failed output transistor in the TIPM, or a mis-wired component — B162C is stored in the BCM or TIPM fault memory. On RAM 1500 and Charger platforms, headlamp control may also pass through a separate headlamp control module (HCM) on models with adaptive or automatic headlamp levelling, making diagnosis more involved.
Symptoms
- Left low beam headlamp inoperative, flickering, or operating incorrectly
- B162C stored in BCM or TIPM fault codes — not accessible via basic OBD-II readers
- Possible TIPM-related malfunctions alongside — other circuits may misbehave if the TIPM output is shorted
- Check engine light may or may not illuminate (depends on whether BCM triggers MIL)
- Possible blown fuse in the headlamp circuit if the short is severe
Common causes
- TIPM output transistor failure — a known Dodge/Chrysler weak point, particularly on 2007–2016 models; the TIPM's internal circuitry for left low beam has failed high
- Wiring short to battery voltage in the left low beam harness — usually a chafed wire contacting the chassis or firewall near the headlamp housing
- Failed left headlamp assembly with a shorted internal ballast (on HID models) or damaged socket creating a positive feedback to the control circuit
- Corrosion in the headlamp connector causing a high-resistance path that reads as high voltage to the TIPM control circuit
- Aftermarket HID or LED headlamp conversion introducing incompatible voltage levels on the OEM control circuit
Diagnostic approach
- Inspect the left headlamp connector and socket for damage or corrosion — Remove the left headlamp assembly or access the connector behind the bumper. Inspect the connector pins for corrosion, heat discolouration (indicating a high-resistance connection), or bent/pushed-back terminals. A damaged socket allowing the high-beam voltage to feed back into the low beam circuit can create a B162C condition.
- Check the left low beam fuse and relay in the TIPM — Locate the headlamp fuse(s) in the TIPM fuse block (typically under the bonnet). Check for a blown fuse; if found, identify and fix the short before replacing the fuse. If the fuse is intact, check the TIPM output voltage with a multimeter — the low beam pin should show battery voltage only when commanded on, not continuously.
- Trace the left low beam wiring harness for chafing or shorts — Follow the headlamp wiring harness from the TIPM through the engine bay to the left headlamp connector. Look for harness routing near sharp metal edges, engine mount points, or areas where insulation can abrade. A short to battery voltage anywhere in this harness will create persistent B162C storage.
- Evaluate the TIPM for internal failure — If the wiring and headlamp assembly are intact, the TIPM's internal headlamp output driver may have failed. Verify by checking whether the high voltage reading exists at the TIPM output pin with the headlamp connector disconnected. If the voltage is still present with no load, the fault is internal to the TIPM. TIPM replacement or rebuilding is the repair — aftermarket TIPM rebuild services are available at lower cost than a new OEM unit.
Make & model notes
Dodge: 2007–2016 Dodge Charger, Challenger, Durango, and RAM 1500: the TIPM is a known failure point across this generation. B162C (left low beam circuit high) is one of many body codes that can result from TIPM internal transistor failures. Rebuilt TIPM services (TIPM Repair, UpFix, Dorman remanufactured) offer cost-effective alternatives to new OEM TIPMs. Always verify whether a TIPM replacement requires VIN programming — most 2013+ TIPMs do.
Dodge: RAM 1500 (2009–2018) with adaptive headlamps: these models may route low beam control through a separate headlamp control module (HCM). If B162C is stored on an adaptive-headlamp RAM, inspect the HCM and its power/ground supply as part of the diagnosis before condemning the TIPM.
FAQ
Is driving with B162C on a Dodge safe?
If the left low beam is inoperative, driving at night without the left headlamp presents a clear safety hazard and is illegal in most jurisdictions. Repair or temporarily use high beams as a workaround until the fault is fixed. If the headlamp is operational but the code is stored without symptoms, the TIPM is likely logging a marginal high-voltage condition that should still be investigated.
Is TIPM failure common on Dodge vehicles?
Yes — the 2007–2016 generation TIPM is among the most frequently cited Dodge/Chrysler component failures. There have been class action lawsuits and NHTSA complaints related to TIPM failures on RAM, Jeep, and Dodge vehicles. Common symptoms include fuel pump failures, no-starts, and electrical accessories running at wrong times — the scope of TIPM failure goes well beyond just headlamp codes.
Can I read B162C with a standard OBD-II scanner?
No. B162C is a body module code stored in the BCM or TIPM, not the powertrain ECM. Standard OBD-II scanners only read P-codes from the powertrain module. A bi-directional scan tool capable of reading body module codes (such as Autel, Launch, or FCA's own wiTECH system) is required to read and clear B162C.
Does replacing the TIPM fix B162C permanently?
If the TIPM's internal output driver has failed, a replacement or rebuilt unit will resolve B162C. However, if the underlying cause is a wiring short or a faulty headlamp assembly, a new TIPM will develop the same fault. Always confirm the external circuit is fault-free before installing a TIPM replacement.