How to Fix Diagnostic Code P1563

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🚨 Diagnostic Profile

Vehicle Make: Chrysler

Description: Cruise control fault indicating a Vehicle Speed Set Speed Difference Too High condition. The system has detected that the difference between the set cruise speed and the actual vehicle speed exceeds the allowable threshold.

🚨 Repair Difficulty Tier

Tier: [Intermediate]

Diagnosis requires scan tool access, live data monitoring, and basic electrical testing of the speed inputs and cruise control switch circuits. Mechanical repairs are typically simple once the faulty component is isolated.

🛠️ Resolution Steps

Step 1: Preliminary Inspection

  • Confirm the customer complaint by road-testing the vehicle with cruise control engaged and recording any speed deviation between the indicated set speed and actual speedometer reading.
  • Inspect the brake pedal and brake light switch for proper adjustment, full pedal travel, and correct switch plunger engagement, as Chrysler PCM/ABS modules use this input to cancel cruise and can flag speed-mismatch faults if the switch sticks or misaligns.
  • Check the steering wheel-mounted cruise control switch pod (or clockspring-integrated switch assembly) for sticking buttons, moisture intrusion, or physical damage, as many Chrysler platforms use a resistor-ladder multiplexed switch circuit shared with the radio/steering control module.
  • Inspect the wheel speed sensor tone rings, sensor air gap, and connector pigtails at all four corners for damage, corrosion, or debris, since Chrysler vehicle speed is typically derived from the ABS wheel speed sensors via the CAN bus rather than a standalone VSS.
  • Check the accelerator pedal position sensor and electronic throttle body for binding, carbon buildup, or sticking that could prevent the PCM from matching commanded throttle to the cruise-requested speed.
  • Inspect the drive belts and tire sizes/pressures for abnormal wear or mismatched diameters, as uneven rolling radius between wheels can create a wheel speed sensor correlation fault that mimics a cruise speed differential code.
  • Review battery state of charge and charging system output, as low system voltage can cause erratic CAN bus communication between the PCM, ABS/IC module, and steering control module.
  • Locate the relevant fuses and relays for the cruise control, PCM, and ABS circuits in the Totally Integrated Power Module (TIPM) or Integrated Power Module (IPM), typically mounted in the engine compartment adjacent to the battery on most Chrysler, Dodge, and Jeep platforms; cross-reference the underhood fuse box label and service information for exact cavity identification for the specific model and year.

Step 2: Diagnostic Verification

  • Connect a factory-capable scan tool (Chrysler wiTECH 2.0 preferred for full bi-directional access) and retrieve all stored and pending diagnostic trouble codes from the PCM, ABS/EBCM, BCM, and steering control module.
  • Record freeze frame data at the time the fault was set, including vehicle speed, cruise set speed, throttle position, brake switch status, and engine RPM.
  • Monitor live data PIDs for set speed, actual vehicle speed, individual wheel speed sensor values, and cruise control switch status during a controlled road test to identify exactly where the speed values diverge.
  • Compare all four wheel speed sensor readings against the PCM-calculated vehicle speed signal on the scan tool to identify any single-wheel mismatch indicating a failing sensor or damaged tone ring.
  • Verify the brake switch signal inputs at the scan tool and confirm the state changes correctly and immediately when the brake pedal is pressed and released, with no erratic transitions.
  • Perform a voltage drop test on the cruise control switch circuit and ground path under load using a digital multimeter; a healthy circuit should read less than 0.5V drop, with excessive drop indicating corrosion or a poor connection.
  • Check sensor signal ground and reference voltage at the relevant module connector using a digital multimeter against a known good ground; most Chrysler wheel speed and position sensors operate on a standard 5V reference circuit, so confirm this reference is present and stable with the key on.
  • Inspect wiring harness continuity and insulation resistance between the affected modules and sensors, comparing results to the resistance and continuity specifications published in the official Chrysler service information for the exact model and year.

Step 3: Resolution & Reset Process

  • Repair or replace the faulty component identified during verification, such as a wheel speed sensor, brake light switch, steering wheel cruise switch pod, clockspring, or a damaged harness section with corroded or open circuits.
  • Clear all diagnostic trouble codes from the PCM, ABS, BCM, and steering control module using the scan tool after the repair is complete.
  • Perform any required relearn, variant configuration, or module reset procedures specified in the official Chrysler service information, such as a steering angle sensor recalibration or BCM configuration update if the clockspring or steering control module was replaced.
  • Road-test the vehicle under varied speed, grade, and braking conditions to confirm the cruise control sets, holds, and resumes speed accurately within normal tolerance.
  • Recheck all modules for stored or pending codes and confirm the Vehicle Speed Set Speed Difference fault does not return after a complete drive cycle and ignition cycle.
  • Document all live data readings, voltage drop results, parts replaced, and final road test confirmation on the repair order.

📦 Parts, Labor, and Budget Estimates

Required Components/Software:

  • ABS wheel speed sensor (one or more corners, as needed based on diagnostic findings)
  • Brake light/pedal position switch assembly
  • Steering wheel cruise control switch pod or clockspring assembly (if integrated)
  • TIPM/IPM fuse or relay for the PCM, ABS, or cruise circuit (if found open or failed)
  • Wiring harness repair kit (connector pins, terminals, heat-shrink splices, dielectric grease)
  • Chrysler wiTECH 2.0 diagnostic software subscription or MicroPod II interface access for full bi-directional scan, module reset, and any required relearn procedures

Average Component Price:

  • ABS wheel speed sensor: $50–$150 per sensor (parts only)
  • Brake light/pedal switch: $15–$45
  • Steering wheel cruise switch pod/clockspring: $100–$350 depending on model and whether airbag clockspring integration is required
  • TIPM fuse/relay: $5–$25; full TIPM module replacement (rare, worst case): $300–$600
  • Wiring repair supplies: $20–$60
  • wiTECH subscription access: approximately $45–$75 per day pass or $190–$240 per month for independent shop subscription tiers

Estimated Labor Hours:

  • Diagnostic time (scan, live data, voltage drop testing): 0.8–1.5 hours
  • Repair and replacement time (sensor, switch, or harness repair): 0.5–2.0 hours depending on component accessibility
  • Verification, relearn procedures, and road test time: 0.3–0.6 hours
  • Total estimated labor: 1.6–4.1 hours (shop book time, exclusive of parts procurement delays)