P0571 Code: Dodge Durango (2021-2024) - Causes, Symptoms & Fixes

Diagnostic guide for P0571 on 2021-2024 Dodge Durango

Important data note

• There are no owner complaints listed for this combination, and no recalls found in the NHTSA database for this make/model/year.
• No recalls found in NHTSA database.

CODE MEANING AND SEVERITY

• Code: P0571
• What it means: P0571 is the Diagnostic Trouble Code for the Cruise Control/EA (Electronic Accelerator) Power Supply Circuit. In practice, it indicates a fault in the power supply line that feeds the cruise control module (and/or the electronic throttle control system) or related power circuitry.
• Severity and behavior on a 2021-2024 Dodge Durango:
  • The most common effect is that cruise control becomes inoperative or intermittently unreliable.
  • The vehicle should still run normally, but the cruise control system may not engage or may disengage unexpectedly.
  • In some cases, intermittent power supply faults can be accompanied by other codes related to the cruise control input or relays.
  • Depending on the root cause, it could also signal a broader electrical/power supply issue (battery/charging, wiring, ground integrity) that could affect other systems.

COMMON CAUSES ON DODGE DURANGO

• Blown or faulty fuse(s) for the cruise control/EA power supply circuit.
• Faulty or binding relay(s) in the cruise control power circuit.
• Damaged or corroded wiring harness or connectors in the EA/cruise control power path (steering column area, under-hood harness, or near the ECU).
• Poor or failed ground connection or voltage supply (battery, alternator, or chassis ground).
• Faulty brake pedal switch (interferes with cruise control logic; can trigger related codes).
• Faulty or degraded ECM/PCM power supply or internal module fault.
• Faulty or dirty/cracked ECU/ECM connector pins leading to intermittent contact.
• Throttle/ETC subsystem issues that affect the EA power supply (less common, but plausible if the ECU is not providing stable power to ETC components).
• Aftermarket electrical additions or wiring alterations that affect the cruise control/EA circuit.
• Battery health or transient voltage issues causing brownouts or spikes.

SYMPTOMS

• Cruise control cannot be engaged or disengages unexpectedly.
• Cruise indicator light on/off inconsistently.
• DTC P0571 stored and possibly other related codes (e.g., P0570, P0572, P0573) depending on the diagnostic situation.
• Intermittent electrical issues or other vehicle subsystems acting odd if power supply is unstable (e.g., dim lights, random ABS/TC alerts) due to shared power/ground problems.
• In rare cases, no obvious symptoms beyond the MIL (malfunction indicator lamp) illumination.

DIAGNOSTIC STEPS

Note: Always start with a full-safe diagnostic approach and verify there are no conflicting codes that could point to a different subsystem.

A. Confirm and baseline

• Use a compatible OBD-II scanner to confirm P0571 and check for additional codes (P0570, P0572, P0573, or any brake pedal, throttle, or CAN network codes).
• Look at freeze frame data (vehicle speed, RPM, engine load, engine voltage, gear, ignition status) to understand the operating condition when the code set.

B. Visual and generic checks

• Inspect all relevant fuses (cruise control, ECU power, IPC/IPM areas) for continuity and blown condition.
• Inspect relays in the same circuit; test or swap with a known-good relay if appropriate.
• Check battery voltage (aim for about 12.6+ volts at rest) and perform a quick charging system check to ensure a stable 13.5–14.8 volts while running.
• Inspect battery terminals and ground connections; look for corrosion, looseness, or damaged grounds (near engine block, chassis grounds, and ECU grounds).
• Inspect wiring harnesses and connectors in key areas:
  • Steering-column area (cruise control switches wiring and clock spring era connections)
  • Under-hood harness routing to the ECU and cruise control module
  • ECU/PCM connectors for signs of corrosion or bent pins

C. Functional checks

• Brake switch: verify that the brake pedal switch is functioning correctly (the cruise control is typically disabled when the brake pedal is pressed). Use the scan tool to monitor the brake switch state and correlate with cruise control behavior.
• Ignition switch and power-up sequence: ensure consistent ignition behavior and stable power to the EA/cruise control circuit during ignition-on.
• Examine live data related to cruise control:
  • Cruise Enable/Disable status
  • Vehicle speed sensor data
  • EA/control module power supply voltage
  • Any CAN bus communication errors involving the ECU/cruise control module

D. Targeted electrical testing (if you’re comfortable and have the tools)

• With ignition on, measure voltage on the EA/cruise power supply circuit at the ECU connector and the cruise control module connector (look for approximately battery voltage when the system is expected to be powered).
• Check ground continuity from the ECU/EA power circuit grounds to a good chassis ground.
• If the vehicle is equipped with a power supply rail or separate ECU power rail fuse/relay, test those paths for voltage drop under load.

E. Isolate and validate

• If a fuse/relay is found defective, replace and re-check for code clearance after road testing.
• If wiring damage or poor connection is found, repair/seat the connector pins, clean corrosion, and reseat.
• If brake switch or ignition components show faults, repair/replace and recheck.
• If no external fault is found, the issue may be internal to the ECU/EA module or its power supply, which often requires professional diagnosis and potentially module replacement or reprogramming.

F. After repair

• Clear the codes and perform a road test to confirm no reoccurrence.
• Monitor live data to ensure stable voltage on the EA power supply circuit and that cruise control can engage and hold speed as required.

RELATED CODES

• P0570: Cruise Control Input Signal Circuit
• P0572: Cruise Control Input Signal Range/Performance
• P0573: Cruise Control/EA Relay Circuit (and related relay concerns)
• Other codes that can appear with cruise control faults: U-codes or data line errors if CAN bus or network communications are affected, or codes related to throttle control if the ETC system is involved.

REPAIR OPTIONS AND COSTS (2025 prices)

Note: Actual costs vary by region, labor rate, and exact root cause. The ranges below are typical ballparks.

A. Fuse or relay replacement (DIY-friendly)

• Parts: $5–$20
• Labor: $0–$50 (if done by you; otherwise, shop rate applies)
• Likely impact: Restores basic power to the cruise control/EA circuit if the fuse/relay was the culprit.

B. Brake switch or ignition switch replacement

• Parts: $20–$120
• Labor: $80–$200
• Likely impact: Fixes power/enable signals that affect cruise control operation.

C. Wiring harness/connector repair or cleaning

• Parts: $0–$100 (hardware only; most costs are labor)
• Labor: $100–$600
• Likely impact: Resolves intermittent power/feed problems due to corrosion, pin distortion, or damaged insulation.

D. Throttle body/ETC actuator or related ECU power subsystem repair

• Parts: $150–$900 (throttle body or actuator; ECU-related parts can be higher)
• Labor: $100–$400
• Likely impact: Restores proper power/command behavior to the electronic throttle control if the issue is correlated with power feeding the ETC system.

E. ECM/PCM replacement or reprogramming

• Parts: $800–$2,500 (new or remanufactured ECU; programming often required)
• Labor: $150–$500
• Likely impact: When the ECU is the actual fault in supplying proper power or processing the cruise control signals, replacement and programming are necessary. This is one of the more expensive resolutions.

F. Cruise control module replacement

• Parts: $300–$1,000 (module itself)
• Labor: $100–$300
• Likely impact: Replaces the cruise control command/relay module if it’s determined to be defective.

G. Additional/indirect fixes

• Battery replacement or charging system repair if confirmed as the root cause (replace battery, alternator, or related wiring): $100–$700 depending on parts and labor.
• CAN bus or network issue repair if related, which can involve multiple modules and wiring.

DIY vs PROFESSIONAL

• DIY-friendly items (if you have basic electrical skills and tools):
  • Checking/replacing a blown fuse or a bad relay
  • Replacing a faulty brake pedal switch
  • Cleaning or re-seating a corroded connector
  • Basic battery and charging system check
• More advanced tasks (recommended to hire a professional):
  • Testing and diagnosing ECU/PCM power supply with proper scan tools
  • Inspecting or repairing harnesses with hidden damage
  • Replacing or reprogramming the ECM/PCM or cruise control module
  • Any chassis or CAN bus diagnostics that require specialized equipment

PREVENTION

• Regular battery health checks and ensuring the charging system maintains proper voltage (12.6V idle, 13.5–14.8V charging when running).
• Avoiding voltage spikes or deep discharges; ensure proper fuse protection is in place and is not bypassed by aftermarket devices.
• Periodic inspection of wiring harnesses around the steering column, under-hood harnesses, and ECU connectors for signs of wear, chafing, or corrosion.
• If you install aftermarket cruise control or other electronic devices, ensure compatibility and proper wiring to avoid interference with the EA/cruise power circuit.
• Address any intermittent electrical symptoms promptly to prevent corrosion and intermittent faults.

Data limitations and context

• The provided data shows no NHTSA complaints or recalls for the 2021–2024 Dodge Durango with this code. This limits a frequency-based assessment of common failures. The diagnostic guide above uses general automotive knowledge and plausible root causes for P0571, tailored to Dodge Durango systems (including drive-by-wire ETC and cruise control hardware) while remaining grounded in typical electrical power-supply failure modes.
• If you suspect a recall or service bulletin could apply but isn’t listed in the provided data, you should still contact a Dodge dealer or check the latest NHTSA/Chrysler bulletin database directly for any updates.