P0579 on 2011-2016 Jeep Wrangler: Cruise Control Switch Performance and Fixes

What's Unique About the 2011-2016 Jeep WRANGLER

The 2011-2016 Jeep Wrangler (JK generation) is notoriously prone to clockspring failures. The clockspring is a coiled electrical connector behind the steering wheel that allows the wheel to turn while maintaining a connection for the airbag, horn, and all steering wheel-mounted switches. Due to its design and the Wrangler's typical use, the clockspring can fail, disrupting signals and triggering P0579. This issue is so common that FCA issued a 15-year, unlimited-mileage extended warranty (code X68) for this specific part on LHD vehicles. Therefore, the clockspring should be the primary suspect, far more so than the switch itself.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Cruise control will not engage or turns off unexpectedly.
• The cruise control indicator light on the dashboard is off or flashes.
• Steering wheel-mounted radio or horn controls work intermittently or not at all.
• Airbag warning light is illuminated on the instrument cluster.
• Traction control light flashes intermittently, causing cruise control to disengage.
• A chime is heard, followed by the entire instrument cluster's lights flashing and gauges resetting.
🎬 Watch: A guide to identifying common clock spring failure symptoms.

Most Likely Causes

1. Faulty Clockspring (Spiral Cable) 🔴 High Probability → Shop Air Bag Clockspring The JK Wrangler's clockspring is highly susceptible to internal circuit failure from wear, and contamination from dust or moisture, especially from off-road use or driving with the top/doors removed. The failure rate is so high that FCA issued a 15-year/unlimited-mile extended warranty (X68) for the part on 2011-2016 LHD models.
   How to confirm: Check the vehicle's VIN for the X68 warranty on the Mopar website. Scan for other codes related to steering wheel functions (airbag, radio, SAS codes like C123F, or U1109). An airbag light is a strong indicator. A definitive test involves using a multimeter to check for continuity and correct voltage through the clockspring's cruise control circuit pins, as demonstrated by DIY repair videos.
   Typical fix: Replace the clockspring assembly. This should be performed by a dealer for free if covered under the X68 extended warranty. If not, it involves removing the steering wheel and airbag module. 🎬 See this step-by-step walkthrough for replacing the clock spring.
   Est. part cost: $150 - $250
2. Defective Cruise Control Switch 🟡 Medium Probability → Shop Cruise Control Switch Switches can fail from normal wear and tear or from liquid spills that corrode the internal contacts. However, this is much less common than clockspring failure on this vehicle.
   How to confirm: Use a multimeter to test the resistance of the switch as each button is pressed. Compare the readings to the specifications in the factory service manual. 🎬 Watch: How to replace the cruise control switch arm. If the readings are out of spec, the switch is bad. Some owners replace the switch only to find the problem persists, indicating the clockspring was the true cause.
   Typical fix: Replace the cruise control switch assembly (Mopar P/N 56046094AF) on the steering wheel.
   Est. part cost: $40 - $80
3. Wiring or Connector Issues ⚪ Low Probability
   How to confirm: Visually inspect the wiring harness and connectors between the cruise control switch, clockspring, and PCM for any signs of damage, corrosion, or loose connections. Perform continuity and voltage drop tests on the circuit.
   Typical fix: Repair the damaged section of wiring or clean/replace the faulty connector.
   Est. part cost: $5 - $50

Rare But Worth Checking

• Powertrain Control Module (PCM) Fault: This is extremely rare. The PCM should only be considered after all other possibilities, including switches, clockspring, and all related wiring, have been thoroughly tested and proven to be good.
• Incorrect PCM Configuration: In a documented case, a Wrangler *without* factory cruise control threw codes P0579 and P0581, suggesting a potential software or configuration issue where the PCM expected a switch that wasn't present. This is highly unusual.

Diagnosis Steps

1. Use an OBD-II scanner to confirm P0579 is present. Check for any other powertrain (P), chassis (C), body (B), or network (U) codes. Note any codes related to the airbag (B-codes), Steering Angle Sensor (C-codes), or LIN bus (U1109).
2. Check your vehicle's 17-digit VIN on the official Mopar recalls website to see if the X68 Clockspring Extended Warranty is active for your vehicle. If it is, contact a Jeep dealer.
3. Test all functions on the steering wheel: horn, radio controls, and all cruise control buttons. Note any that are inoperative or intermittent.
4. If an airbag light is on or other steering wheel controls are failing, the clockspring is the most likely culprit.
5. If only the cruise control is affected, you can test the switch. Disconnect it and use a multimeter to measure the resistance across its pins while pressing each button. Compare these values to the service manual specifications.
6. To definitively test the clockspring, access the connectors on the steering column side and the switch side. Use a multimeter to check for continuity on the wires corresponding to the cruise control circuit. A lack of continuity or high resistance indicates a broken internal ribbon.
7. If the clockspring and switch both test good, inspect the wiring harness from the steering column to the PCM for any visible damage, chafing, or corrosion at the connectors.
8. If all wiring and components test good, the final and least likely possibility is a fault within the PCM.

Parts You'll Likely Need

• Clockspring (OEM #5156106AG) — This is the most common point of failure on the 2011-2016 Wrangler for this code. Part number 5156106AG supersedes older versions 5156106AE and 5156106AF. Check for X68 warranty coverage before purchasing.
  Trusted brands: Mopar
  OEM price range: $150-$250
  Aftermarket price range: $50-$120
• Cruise Control Switch (OEM #56046094AF) — The switch itself can fail due to wear or contamination. A secondary possibility is part number 68272141AB for some 2011 models. This is a much less likely cause than the clockspring.
  Trusted brands: Mopar, Standard Motor Products
  OEM price range: $60-$100
  Aftermarket price range: $30-$60

Related Codes That Often Appear With This One

• U1109 — Relates to 'Lost Communication With Lin Steering Wheel Controls'. Its presence is a very strong indicator of a clockspring failure and is one of the specific DTCs listed in the X68 extended warranty bulletin.
• P0581 — Relates to 'Speed Control Multiplexed Switch #1 High', indicating another fault in the same cruise control switch circuit.
• P0591 — Relates to 'Speed Control Multiplexed Switch #2 Performance', indicating a fault in the other cruise control switch circuit, often pointing to a shared problem like the clockspring.
• C123F, C1219, C2205 — These are chassis codes related to the Steering Angle Sensor, which is integrated with the clockspring. Their presence alongside P0579 strongly suggests a clockspring assembly failure.
• Airbag Codes (B1B00-B1B07) — Any active airbag codes accompanied by an airbag warning light are a major clue that the clockspring has failed, as it contains the critical wiring for the driver's airbag. These codes are also listed as qualifying conditions for the extended warranty.

Technical Service Bulletins (TSBs) & Recalls

• NHTSA TSB MC-10217579-9999 (supersedes 08-005-17 REV. A): This bulletin details the X68 Extended Warranty. It lists the specific DTCs (including P0579, P0581, P0591, C123F, and U1109) that qualify a vehicle for a free clockspring replacement if diagnosed by a dealer.
• NHTSA Recall 16V-288 (FCA S40): This recall addresses clockspring failure due to dust intrusion on Right-Hand Drive models, which could lead to non-deployment of the airbag. While it addresses the same component, the X68 warranty is more applicable to most North American owners.

Platform-Specific Known Issues

• FCA issued the X68 Extended Warranty for the clockspring on 2011-2016 Left-Hand-Drive Jeep Wranglers, extending coverage to 15 years with unlimited mileage. This is separate from recall S40 (NHTSA 16V-288), which was for Right-Hand-Drive models. The X68 warranty acknowledges that the clockspring's internal circuits can fail, causing the airbag light to illuminate and/or failure of the horn, cruise control, and other steering wheel buttons. Owners experiencing these issues should have a dealer check their VIN for free replacement, though parts are sometimes back-ordered.
• The Wrangler's design, which encourages driving with the top and doors off, makes it more susceptible to dust and moisture entering the steering column and damaging the clockspring, a factor contributing to its high failure rate.

Mechanic-Grade Diagnostic Values

• Speed Control Signal #1 Circuit (V71) voltage at S/C Switch harness connector, ignition on, switch disconnected. — expected: 4.5 to 5.5 volts. Failure: Voltage below 4.5V indicates an open or short to ground; voltage above 5.5V indicates a short to voltage.
• Voltage on S/C Signal #1 circuit (V71) when pressing cruise control buttons. — expected: ON/OFF: 0.85-1.00V, SET: 3.29-3.39V, RESUME/ACCEL: 3.98-4.05V, CANCEL: 1.72-1.82V. Released: 4.49-4.56V.. Failure: Any voltage outside of these specific ranges for a given button press indicates a fault in the switch or circuit.
• Resistance of S/C Signal 1 Circuit (V71) and S/C Return Circuit (V937) between switch connector and PCM connector. — expected: Below 5.0 ohms. Failure: Resistance above 5.0 ohms indicates an open or high resistance in the circuit, likely a broken wire in the clockspring.

Scan Tool Commands That Help

• wiTECH or equivalent professional scan tool: Live Data - Speed Control Switch Status — To verify if the PCM is receiving the button press signals correctly. The scan tool should display 'ON/OFF', 'SET', 'RESUME', etc., as each button is pressed. If a button is pressed and the status does not change, it points to a fault in the switch, clockspring, or wiring.

Wiring & Ground Locations

• (V71) S/C Signal #1 Circuit — Runs from the cruise control switch, through the clockspring, to the C3 connector at the Powertrain Control Module (PCM).. This is the primary signal wire the PCM monitors for voltage changes to determine which cruise button is pressed. P0579 is set when the voltage on this circuit is implausible.
• (V937) S/C Switch Ground Circuit — Runs from the cruise control switch, through the clockspring, to the PCM, providing a ground reference for the switch.. An open or high resistance in this shared ground circuit will cause all switch voltage readings to be incorrect, leading to P0579 and often P0591 simultaneously.
• C3 PCM Harness Connector — The third large harness connector at the Powertrain Control Module (PCM).. This is the termination point for the cruise control switch wiring. Technicians may need to test for continuity or voltage at this connector to isolate a wiring fault from a PCM fault.

Real Owner Repair Stories

• YouTube channel 'Bullshitkorner' (2014 Jeep Wrangler JKU) — Cruise control not working. Codes P0579, P0581, P0591 present.
  ❌ Tried (didn't work) Replaced the cruise control switch assembly on the steering wheel.
  ✅ What actually fixed it The clockspring was faulty. Diagnostic testing showed ~5V power going into the clockspring from the PCM, but no signal voltage coming out the other side. Replacing the clockspring resolved all codes and restored cruise control function.
• JK-Forum.com user reports (2011 Jeep Wrangler JKU) — Cruise control works intermittently or not at all; have to press the button dozens of times.
  ❌ Tried (didn't work) Dealer replaced the cruise control switch, but the problem returned after a month.
  ✅ What actually fixed it Multiple users confirmed the underlying issue was the clockspring. A common, informal diagnostic was to give the steering wheel a 'good whack' at the 10 or 2 o'clock position, which would temporarily restore function, strongly indicating a broken internal connection within the clockspring.

OEM Part Supersession History

• 5156106AE, 5156106AF → 5156106AG — Improved design to address the high failure rate of the internal ribbon cable.
  Heads up: The newer part (AG) is a direct replacement for the older versions and is fully compatible. No known incompatibility issues.

Model Year Variations Within This Range

• 2011-2016: The 2011 model year introduced a completely redesigned interior, including the steering wheel and its associated controls. This design remained largely unchanged through 2016. The primary powertrain change (3.8L to 3.6L engine in 2012) did not affect the clockspring or cruise control switch diagnostics for code P0579.