C1314

Code

Generic C — Chassis

ABS Pump Motor Circuit Failure

Brand: Generic

Type: C — Chassis

Views: UK: 8 EN: 9 RU: 28

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Page language: EN

Causes

Blown fuse for ABS pump motor power
Faulty ABS pump motor
Failed pump motor relay or driver
Open, shorted, or high-resistance wiring/connectors between module and pump
Corroded or poor ground connection
Faulty ABS control module (driver output)

Symptoms

ABS and/or traction control warning lamp illuminated
ABS not available message on dash (vehicle-dependent)
Pump does not run when commanded (active test)
Unusual brake pedal feel during ABS events or during prolonged braking
ABS may not activate during wheel slip, leading to loss of ABS/traction function
Possible fuse or relay overheating smell (in severe faults)

What to check

Retrieve freeze frame data and full DTC list with a scan tool; note any related codes
Perform visual inspection of pump motor, wiring harness, connectors, and grounds for corrosion, damage, or loose pins
Check pump motor fuse and ABS relay for continuity and correct operation
Use scan tool to command pump motor (actuator/active test) and observe response
With key ON (engine off), measure supply voltage at pump power pin and ground continuity at pump connector
Measure motor resistance at connector (with battery disconnected) and compare to vehicle specification where available

Signal parameters

Pump power (battery) pin: ~11–14 V with ignition ON (vehicle-specific)
Ground continuity: close to 0 Ω from pump ground to chassis ground (vehicle-specific)
Pump motor resistance: typically low (a few ohms) — exact spec vehicle-specific
Pump motor operating current: several amps when running; can be 5–20 A depending on vehicle (check manufacturer spec)
Control output from ABS module: switched 12 V or PWM/ground-switched driver when commanded (verify with oscilloscope/scan tool)

Diagnostic algorithm

Record all ABS/related codes and freeze frame data with a scan tool
Perform visual inspection of pump, connectors, wiring, and grounds for corrosion, damage, or loose terminals
Check ABS pump motor fuse and relay; replace if blown/faulty and retest
With battery connected and ignition ON, measure battery voltage at pump power pin; if low or absent, trace and repair power feed
Command pump motor with scan tool; if pump runs and code clears, retest and monitor for recurrence
If no power at pump pin but fuse/relay OK, test relay coil and control circuit (verify module driver output)
Disconnect pump connector, measure motor resistance to ground (with battery disconnected); if open or infinite, replace or bench-test pump motor
If motor has low resistance but does not run when powered, bench-test motor with a fused 12 V supply to verify operation
If motor draws excessive current or is locked, replace pump assembly
If wiring and pump check OK, suspect ABS control module driver fault; verify module grounds and power, consult manufacturer repair procedures before replacement
After repairs, clear codes, perform ABS system readiness/bleeding if hydraulic work was done, and road test to confirm proper ABS operation

Likely causes

Blown motor power fuse or faulty relay
Corroded connector at pump or module
Open/short in harness between ABS control module and pump motor
Failed/locked pump motor drawing excessive current
Faulty ABS module driver transistor

Fault status

⚠️ Status

C1314 — ABS pump motor circuit failure (open/short/high resistance or driver fault). ABS/traction warning illuminated; pump may not operate when commanded.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours

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