Code
P1504
DAEWOO
P — Powertrain
V' CLE SPD SNR FLT( CAN COMMERR)
AI status
Completed
Completed
100%
Causes
- Open, short or high-resistance wiring between speed sensor / ABS/TCS module and CAN network
- Corroded or loose connector at speed sensor, ABS/TCU/BCM or instrument cluster
- Failed wheel speed sensor, vehicle speed sensor (VSS) or ABS module
- Faulty ECM/BCM/TCU not transmitting/receiving CAN messages
- Missing or incorrect CAN bus termination (open/miswired termination resistor)
- Blown fuse or power supply problem for the module that publishes speed data
Symptoms
- Check Engine lamp (MIL) on
- Speedometer/odometer inoperative or jumping
- Cruise control disabled or nonfunctional
- ABS, traction control or stability control warnings may illuminate
- Transmission shifting irregular or limp-home mode (if TCM requires speed)
- Reduced or nonfunctional speed-dependent features (e.g., shift logic, wipers tied to speed)
What to check
- Retrieve stored and pending DTCs with a full-systems scan tool; note freeze-frame data
- Confirm presence or absence of vehicle speed data on scan tool live-data screens
- Check for related U-codes (CAN communication) and ABS/transmission module faults
- Visually inspect connectors and wiring at ABS unit, instrument cluster, ECM/TCU and speed sensor(s)
- Check fuses and power/ground for modules that supply or use speed data
- Measure CAN bus idle voltages and termination resistance between CAN_H and CAN_L
Signal parameters
- Idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines ~2.5 V relative to ground at recessive state)
- Dominant states: CAN_H rises toward ~3.5 V, CAN_L drops toward ~1.5 V; differential ≈ 2 V
- Termination resistance: ≈ 60 ohms measured between CAN_H and CAN_L with ignition on (two 120 Ω in parallel)
- Vehicle speed message frequency: typically 1–20 Hz depending on speed and module (varies by vehicle)
- Expected live-data: vehicle speed should update steadily with wheel rotation; sudden loss = no CAN frames or invalid frames
Diagnostic algorithm
- Read all codes and freeze-frame data using a capable scan tool. Note related communication (U) codes and which modules do not respond.
- Attempt to view vehicle speed PID from ECM/ABS/TCU on scan tool. If speed PID is absent or reads zero while vehicle is moving, proceed.
- Visually inspect connectors and harnesses at ABS module, instrument cluster, speed sensor(s) and relevant junctions. Repair any obvious damage/corrosion.
- Check power and ground circuits for modules that publish or consume speed data (ABS, BCM, TCU, instrument cluster). Replace blown fuses and fix grounds.
- Measure bus termination resistance between CAN_H and CAN_L (~60 Ω). If open or out of range, trace wiring and check termination resistors.
- With key on, measure CAN_H and CAN_L voltages at several module connectors. If voltages not near 2.5 V idle or show short to power/ground, isolate and repair wiring.
- Use an oscilloscope or CAN analyzer to observe CAN waveforms and look for the presence of vehicle speed CAN frames and for noise or missing frames. Identify the module that should be transmitting speed.
- If wiring and CAN bus are good but the expected module does not send speed data, try waking or reprogramming the module where applicable. If still non-responsive, replace the faulty module (ABS/TCU/BCM/instrument cluster) only after confirming failure.
- After repairs, clear codes, road test to verify speed data present and stable, and confirm no recurrence of P1504.
Likely causes
- Damaged harness or pin pushed out at ABS/ECU connector
- CAN bus short to battery or ground in wiring near sensor or module
- Intermittent connector making/wearing causing intermittent CAN frames
- ABS or instrument cluster module failure preventing speed messages
- Aftermarket device or recent repair disturbed CAN wiring/termination
Fault status
Status
Vehicle speed sensor / speed signal fault — CAN communication error. Speed data not being received or valid on the CAN bus.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Repair manuals
Manual library for DAEWOO
75
Browse 75 DAEWOO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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