Code
C1295
HUMMER
C — Chassis
Brake Control Module Voltage Low
Views:
UK: 14
EN: 18
RU: 14
AI status
Completed
Completed
100%
Causes
- Weak or discharged vehicle battery
- Poor battery terminals or corroded connections
- Failing alternator or poor charging system output
- Blown fuse or fusible link supplying the brake control module
- Damaged wiring or connector to the brake control module (open or high-resistance)
- Poor engine/chassis ground(s)
Symptoms
- ABS, Traction Control and/or Stability system warning lights illuminated
- Brake warning lamp illuminated or chime on key-on
- Loss or reduction of ABS/traction control functions
- Intermittent or permanent braking system faults under load
- Possible engine or charging system warning lights if charging affected
- Vehicle may enter degraded/brake assist-limited mode
What to check
- Read and record freeze-frame and related ABS/BCM codes with a capable scan tool
- Check battery resting voltage (key off) and voltage with engine running
- Perform battery load/health test
- Inspect and clean battery terminals, positive feed, and ground connections
- Verify fuses/fusible links and relays in the power feed circuit to the brake control module
- Probe module supply pin for VBATT and measure ground continuity to chassis
Signal parameters
- Battery resting voltage (key off): ~12.4–12.8 V (healthy battery)
- Charging voltage (engine running): ~13.5–14.8 V
- Cranking voltage: normally above ~9.0–10.5 V depending on starter and battery condition
- Brake control module supply pin: should follow battery/charging voltage and not drop below safe operating threshold during normal operation
- High-resistance supply/ground may show voltage drops under load or intermittent fluctuations
Diagnostic algorithm
- Connect a scan tool, record C1295 and any related codes, and view freeze-frame data to note voltage at time of fault.
- Inspect battery condition and test with a battery tester; recharge or replace if weak.
- Visually inspect and clean battery terminals, main positive feed, and chassis/engine grounds. Tighten connections to spec.
- Verify fuses/fusible links/relays that feed the brake control module; replace any blown or corroded parts.
- With a DVOM or scope, measure voltage at the brake control module power pin and a good ground: check key-off, cranking, and engine-run conditions and observe for undervoltage or drops under load.
- If voltage drops are observed, trace wiring back to the battery/power distribution center. Repair damaged wiring, terminals, or connectors and ensure good grounds.
- Test alternator output and charging system under load; repair charging faults if present.
- After repairs, clear codes and perform functional tests (ABS pump activation, road test with scan tool) to confirm the fault does not return.
- If supply and ground are confirmed good and problem persists, consider replacement or bench verification of the brake control module per manufacturer service procedure.
Likely causes
- Low battery state of charge or weak battery
- Corroded/loose battery cable or ground strap
- Low alternator output under load
- High resistance in power feed or ground to the brake control module
- Blown or corroded fuse feeding the ABS/BCM power circuit
Fault status
Status
Brake control module supply voltage below expected threshold detected. ABS/ESC faults present; system may be disabled or degraded until supply is restored.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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