C1650 — RSS Control Module Fault

Causes

• Faulty RSS control module (internal failure)
• Loss of power or poor ground to the RSS module
• Damaged or corroded connector or wiring to the RSS module
• CAN bus/communication fault between RSS and other modules (BCM/ABS/ECM)
• Blown fuse or low battery voltage
• Water intrusion or physical damage to the module

Symptoms

• ABS/ESC/RSS or stability warning lamp illuminated on instrument cluster
• Traction control or stability functions disabled or degraded
• Related fault codes stored in ABS/BCM/ECM modules
• Possible reduced vehicle safety/performance during evasive maneuvers
• DTC remains after key cycles or returns intermittently

What to check

• Read all stored and pending codes from ABS, BCM and ECM with a capable scan tool; note freeze frame and history
• Inspect RSS module connector and wiring for corrosion, physical damage, water intrusion, broken pins or pushed-out terminals
• Check vehicle battery voltage and charging system; verify voltage at RSS module with ignition on (reference vehicle spec)
• Verify fuses and relays supplying the RSS/ABS/vehicle stability systems
• Using a scan tool, verify RSS module presence on the vehicle network and ability to communicate (request module ID/parameters)
• Check for related CAN/U codes (U0100, U0073, etc.) that indicate bus issues

Signal parameters

• Module supply voltage: battery voltage with ignition on (nominal ~12 V; should be within manufacturer spec)
• Ground resistance: module ground to chassis < 2 ohms
• CAN bus: bidirectional communication present on CAN High/Low (no short to battery/ground)
• RSS outputs (as reported by scan tool): roll angle/roll rate, yaw rate, lateral acceleration — values should update when vehicle moved; typical ranges: yaw rate ±200 deg/s, lateral accel ±2–3 g, roll angle small in normal driving (few degrees)
• No/Intermittent CAN frames from RSS module or repeated transmission errors reported by scan tool

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