C1260
Speed Wheel RR Comparison Failure
Chassis Chassis/Safety ABS wheel speed sensor 🔴 Serious — Stop or limit driving
💬
What This Actually Means
In plain language — no jargon

Your right rear wheel speed sensor is sending data that doesn't match what the ABS system expects. It's like one speedometer needle on your dashboard suddenly reading differently than the others.

⚡
Symptoms You May Notice
3 known symptoms for this code
ABS warning light illuminated on dashboard
Loss of ABS function or reduced braking performance
Traction control or stability control disabled
🔬
Embedded Systems Insight
What the ECU/ECM is actually computing

The ABS module compares wheel speed signals from all four wheels to detect skidding and lock-up conditions. The right rear wheel speed sensor signal is being flagged as inconsistent or implausible compared to the other three wheels. The ECU checks if speed differences exceed normal thresholds for acceleration, deceleration, and vehicle dynamics.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
RR wheel speed vs. other wheels ±10-15% variation during normal driving Speed difference >25% or signal dropout detected
Sensor signal voltage 0.2-0.8V AC alternating pattern No signal, constant voltage, or erratic pulses
🔧
Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Right rear wheel speed sensor connector
Inspect connector for corrosion, moisture, or loose pins and clean or reseat the connection.
2
Right rear wheel speed sensor wiring harness
Check for damaged, pinched, or frayed wires along the harness routing and repair or replace as needed.
3
Right rear wheel speed sensor
Replace the sensor if wiring and connections are intact; it may be defective or misaligned.