Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P1588 — accelerator return spring control unit loss control unit

P1588 — accelerator return spring control unit loss control unit

Detailed page for trouble code P1588.

35,619codes
59brands
11,925generic
23,694specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P1588

LAND ROVER P — Powertrain

accelerator return spring control unit loss control unit

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty accelerator return spring control unit/module
  • Defective accelerator pedal position (APP) sensor/module
  • Open, shorted or corroded wiring or connectors between pedal/module and PCM/ECU
  • Poor ground or lost 12V supply to the control unit
  • Intermittent connection or broken wire (wear at harness/connector)
  • PCM/ECU software or hardware fault

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning lamp illuminated
  • Reduced engine power / limp-home mode
  • Delayed or inconsistent throttle response and poor driveability
  • Cruise control disabled
  • Pedal may feel loose, stuck, or lack expected return force
  • Stored DTCs related to throttle/pedal/actuator circuits

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect pedal assembly, return spring and surrounding wiring for damage, chafing or contamination
  • Visually inspect connectors for corrosion, bent pins, or water ingress
  • Check vehicle fuses and relays related to throttle/pedal circuits and replace if faulty
  • Monitor live data: APP sensor voltages, return spring control status, and related CAN/LIN messages
  • Perform wiggle test of harness/connectors while monitoring live data for intermittent changes

Signal parameters

  • APP sensor voltages typically ~0.5–4.5 V across travel (varies by manufacturer)
  • Redundant APP sensors should correlate (Sensor A vs Sensor B) — low deviation between them
  • 5V reference supply present at APP sensors
  • Ground continuity to pedal/module < 1 ohm expected
  • Return spring control unit supply: fused 12 V and reliable ground
  • CAN/LIN bus: nodes present and transmitting (no bus errors)

Diagnostic algorithm

  1. Pull and record P1588 and any related codes with a factory-capable scan tool.
  2. Visually inspect the accelerator pedal assembly, return spring and all connectors for damage, contamination or loose connections.
  3. Clear codes, perform functional test of APP sensors using live data: slowly depress/release pedal and observe linear, smooth voltage changes for each sensor.
  4. Check 5V reference and ground at pedal connector with a multimeter; verify 12V supply to return spring control unit if separate.
  5. Perform resistance and continuity checks on wiring between pedal/module and PCM — inspect at common stress points (firewall hinge, under-dash).
  6. If intermittent, perform wiggle test while monitoring live data to reproduce event.
  7. If wiring and power/ground are good, test the return spring control unit: verify communication on CAN/LIN, check for PWM/actuator outputs using an oscilloscope if available.
  8. Swap or bench-test a known-good pedal/control unit only if OEM diagnostic guidance allows — avoid unnecessary replacement.
  9. If module replacement is done, reprogram/perform throttle adaptation and clear codes; road-test to verify fault does not return.
  10. If steps fail, consult manufacturer technical service bulletins and wiring diagrams or escalate to dealer-level diagnostics.

Likely causes

  • Damaged/contaminated connector at pedal or control unit
  • Accelerator pedal assembly failure (internal sensor or spring mechanism)
  • Failing return spring control actuator
  • Frayed or chafed wiring in the pedal harness (common at firewall or hinge)
  • Blown fuse or weak battery/charging causing supply loss to module

Fault status

⚠️ Status
Loss of control/communication with accelerator return spring control unit detected. Inspect accelerator pedal assembly, wiring, connectors, power/ground and control unit for faults. Verify communications and live sensor data.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0120 P0121 P0220 P0221 P2135 P2100
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .