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Clock Spring for Ram 1500, 2500, 3500, Laramie and Dodge Viper (Non-Heated): What It Fits

If your Ram 1500, 2500, or 3500 has no heated steering wheel, or you run a Gen V Dodge Viper (2013-2017), this is the matching part. It is a pre-calibrated spiral ribbon cassette that keeps the driver airbag, horn, steering wheel audio and cruise controls, and the Steering Angle Sensor (SAS) connected across the full ±900° rotational range.

The unit is validated against SAE J2344 (2025 revision) for airbag deployment integrity and meets ISO 26262 ASIL-B functional safety requirements for SAS signal fidelity on CAN FD 2.0 networks. The PTFE-impregnated polyimide ribbon cable is rated for 1.8 million or more full-lock cycles, above the 2026 OEM lifecycle benchmark set by Stellantis (FCA).

Diagnostic coverage spans B0000-B2999 (SRS/Airbag), C0000-C1999 (Chassis/SAS), and U0000-U1999 (CAN Communication). View the full 2026-ready clock spring specification here.

Why These Clock Springs Fail

Clock spring faults are among the most misdiagnosed problems on Stellantis full-size trucks and the Viper. The ribbon cable alone is rarely the root cause. Cumulative degradation stacks up in three ways.

• Trace micro-fracturing: the copper trace inside the polyimide substrate cracks under thermal cycling from -40°C to +125°C.
• Connector oxidation: the pin interface at the SCCM (Steering Column Control Module) corrodes and goes intermittent.
• SAS signal drift: the Hall-effect sensor array drifts past the ±3.5° threshold the ABS/ESC module tolerates.

PTFE-Impregnated Polyimide Ribbon

This unit uses a PTFE-impregnated polyimide ribbon instead of the standard POM (polyoxymethylene) ribbon in earlier OEM iterations. PTFE cuts inter-layer friction by 42% versus POM under high humidity (85% RH at 60°C), which nearly eliminates the ribbon bunching failure mode documented in NHTSA TSB 19-001-21 for Ram trucks.

The copper traces carry an electroless nickel immersion gold (ENIG) finish. That stops the oxidation-related intermittent open circuits that trigger spurious B0012 and B0013 codes.

SAS Calibration and CAN FD 2.0 Arbitration

The embedded Steering Angle Sensor talks over two independent CAN FD channels, 500 kbps base rate and 2 Mbps FD payload. Dual-channel redundancy meets ISO 26262 ASIL-B, which 2026 Ram trucks need for Level-2 ADAS with adaptive cruise control and lane centering. Angle output is absolute at 0.1° resolution, factory pre-indexed at 0° ±0.5°.

After installation, run a SAS re-zero over OBD-II (PID 0x25) to synchronize the ESC yaw-rate sensor cluster. If U0126 or U0428 persists, check the CAN termination: measure 120Ω between CAN-H and CAN-L at the SCCM connector.

Full Specification Matrix

Every value below comes from the published technical data. Match it against your original part number before you order.

DTC Coverage: What This Unit Resolves

The integrated SAS maps faults across the B0000-B2999, C0000-C1999, and U0000-U1999 ranges. The documented clusters this unit resolves or prevents:

• SRS/Airbag: B0001-54 (Missing Calibration), B0012-11 (Resistance Low), B0013-13 (Open Circuit), B0014-12 (Short to Ground), B0020-1A (Driver Squib Resistance Below Threshold).
• Chassis/SAS: C0051-62 (Signal Compare Failure), C123F-00 (SAS Comparative Performance).
• CAN Communication: U0126-00 (Lost Communication With SAS), U0428-00 (Invalid Data From SAS), U0131-00 (Lost Communication With PSCM).

Codes that survive a replacement usually trace to wiring resistance or bus termination. Check the full DTC coverage for your model year here.

Symptom Stages on a Ram 3500

Heavy-duty Ram 3500 applications fail in a predictable order. Plan the repair before Stage 4.

• Stage 1: Intermittent horn operation, worst at full lock.
• Stage 2: Steering wheel audio and cruise controls turn erratic or dead.
• Stage 3: Airbag warning lamp with B0012 (Deployment Loop Resistance Low) or B0013 (Open).
• Stage 4: ESC/ABS lamp with C123F or U0428, meaning SAS signal corruption.

A clicking or scraping sound while you turn the wheel means the ribbon has physically delaminated. Replace the assembly immediately so the airbag deployment circuit stays intact. Order a 2026-spec clock spring here.

Installation and Verification

18 Pins or 22 Pins: Identify Your Variant

The heated wheel version uses a 22-pin SCCM connector with two extra circuits for the heating element (thermistor plus resistive coil). The non-heated unit has 18 pins. Count the pins on your SCCM connector: 18 means this unit is a direct fit, 22 means you need the heated variant. On 2026 Ram HD models the SCCM architecture stays pin-compatible with the 2019-2024 generation.

Viper Gen V SAS Relearn (Mandatory)

The 2013-2017 Viper uses a 14-pin SRT-specific SCCM, and its Bosch M5.2 ABS/ESC module does not auto-learn the SAS zero point. Run this sequence after every replacement:

1. Connect a Chrysler-compatible scan tool (wiTECH 2.0 or equivalent).
2. Open ABS Module, then Special Functions, then SAS Calibration.
3. Wheels straight ahead, run the Learn Zero Position routine.
4. Cycle the ignition off for 60 seconds.

The unit stays backward compatible with the Viper's CAN 2.0B (500 kbps) bus. If U0126 still will not clear, measure the CAN-C network: it needs 60Ω impedance at the SCCM node. An open termination resistor keeps the code alive.

Ram Post-Install Checklist

1. Clear all SRS, ABS, and SCCM DTCs via OBD-II Mode 0x04.
2. Run the SAS re-zero via OBD-II PID 0x25 or the scan tool ABS special function.
3. Verify steering angle reads 0° ±1° with wheels straight.
4. Do a full lock-to-lock sweep. The angle must track linearly with no dropouts or implausible jumps.
5. Test horn, cruise, and audio switches at every steering position.

Skip the re-zero and C123F plus U0428 return with the ESC/ABS lamp lit. The ENIG traces hold resistance drift to ≤0.05Ω across the full thermal range, but the vehicle-side calibration still has to be done.

Frequently Asked Questions: Ram and Viper Clock Spring Faults