Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P023C — Charge Air Cooler Coolant Pump A Control Circuit High

P023C — Charge Air Cooler Coolant Pump A Control Circuit High

Detailed page for trouble code P023C.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P023C

Generic P — Powertrain

Charge Air Cooler Coolant Pump A Control Circuit High

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

Causes

  • Short to battery voltage in pump control circuit
  • Failed/intermittent charge air cooler coolant pump
  • Corroded/loose connector or terminal
  • Faulty pump relay or fuse (if used)
  • Damaged wiring harness (chafing, pinched, internal short)
  • Poor ground at pump or ECM

Symptoms

  • MIL (Check Engine Light) illuminated
  • Stored P023C in engine control module freeze frame data
  • Reduced or no intercooler/charge air cooler coolant circulation
  • Elevated charge air cooler or intake air temperatures under boost
  • Possible engine derate or limp mode on some vehicles
  • Unusual electrical smell or visible damage at connector

What to check

  • Retrieve freeze frame and live data with a scan tool to confirm conditions when the code set
  • Perform a complete visual inspection of pump, connectors, wiring harness, and nearby components for damage, corrosion, or pinching
  • Inspect and test related fuses and relays for the coolant pump circuit
  • Check connector pins for corrosion, bent pins, or pushed-out terminals
  • Measure supply voltage and ground at the pump connector with ignition ON and while commanding pump ON via scanner
  • Check for continuity and shorts between pump control wire and battery positive/ground

Signal parameters

  • Expected control signal: PWM or switched 12V control from ECM or relay (varies by vehicle)
  • Idle/standby: control output typically low or open (0–0.5 V) when pump not commanded
  • Commanded ON: control circuit may switch to battery voltage (~11–14 V) or use PWM (0–100% duty) — verify with vehicle-specific data
  • Pump motor resistance: typically low (single-digit ohms to tens of ohms) — compare to manufacturer spec
  • No-load current: measurable when pump commanded; unusually high current suggests internal short or seizure

Diagnostic algorithm

  1. Connect a scan tool, read freeze frame and live data, and confirm P023C is active (not historical)
  2. Visually inspect pump, harness, and connectors for damage, corrosion, or signs of overheating; repair as needed
  3. Check and record battery voltage with ignition ON and while pump is commanded to run
  4. With harness disconnected, measure resistance of the pump motor to ground and between supply and control pins; compare to spec — very low resistance or short to chassis indicates internal pump fault
  5. Backprobe the pump connector while commanding the pump ON; verify the control line voltage and/or PWM signal and ground are within expected ranges
  6. If control line is high when pump is OFF, inspect for short to battery on control wiring; if control line is high when commanded ON but pump does not run, check ground or motor condition
  7. Perform continuity and short-to-power/short-to-ground checks on wiring between pump and ECM/relay with connector disconnected; repair wiring as necessary
  8. Swap or bench-test relay (if applicable) and inspect associated fuses; replace suspect relay/fuse
  9. If wiring, connectors, relay, and pump check good, consider ECM or pump driver module fault — consult manufacturer service information before replacing ECM
  10. After repairs, clear codes, perform a functional test of the pump under all conditions, and verify no return of the code

Likely causes

  • Shorted power feed or switched supply to the pump control line
  • Failed pump motor with internal short to supply
  • Corroded connector causing intermittent high resistance and voltage spikes
  • Damaged wiring harness contacting chassis or other power conductors
  • Faulty relay or fuse supplying pump circuit

Fault status

⚠️ Status
Control circuit for Charge Air Cooler Coolant Pump A is reporting a voltage/signal above the expected range. ECM stored P023C and may inhibit or alter pump operation until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0627 P0628 P0480 P023B P0299
9,518

The library contains 9,518 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

ALFA ROMEO
89
AUDI
1,243
BMW
479
CADILLAC
206
CHEVROLET
456
CHRYSLER
193
DAEWOO
75
FIAT
26
GENESIS
207
HUMMER
138
HYUNDAI
371
ISUZU
229
KIA
155
LAND ROVER
266
LEXUS
280
LINCOLN
166
MERCEDES-BENZ
856
MERCURY
296
MITSUBISHI
406
PORSCHE
136
TESLA
58
TOYOTA
2,209
TRIUMPH
131
VOLKSWAGEN
626
VOLVO
221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P023C

LAND ROVER P — Powertrain

Control of the cargo air conditioning pump - high circuit

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

Causes

  • Short to battery voltage in pump control circuit
  • Failed/intermittent charge air cooler coolant pump
  • Corroded/loose connector or terminal
  • Faulty pump relay or fuse (if used)
  • Damaged wiring harness (chafing, pinched, internal short)
  • Poor ground at pump or ECM

Symptoms

  • MIL (Check Engine Light) illuminated
  • Stored P023C in engine control module freeze frame data
  • Reduced or no intercooler/charge air cooler coolant circulation
  • Elevated charge air cooler or intake air temperatures under boost
  • Possible engine derate or limp mode on some vehicles
  • Unusual electrical smell or visible damage at connector

What to check

  • Retrieve freeze frame and live data with a scan tool to confirm conditions when the code set
  • Perform a complete visual inspection of pump, connectors, wiring harness, and nearby components for damage, corrosion, or pinching
  • Inspect and test related fuses and relays for the coolant pump circuit
  • Check connector pins for corrosion, bent pins, or pushed-out terminals
  • Measure supply voltage and ground at the pump connector with ignition ON and while commanding pump ON via scanner
  • Check for continuity and shorts between pump control wire and battery positive/ground

Signal parameters

  • Expected control signal: PWM or switched 12V control from ECM or relay (varies by vehicle)
  • Idle/standby: control output typically low or open (0–0.5 V) when pump not commanded
  • Commanded ON: control circuit may switch to battery voltage (~11–14 V) or use PWM (0–100% duty) — verify with vehicle-specific data
  • Pump motor resistance: typically low (single-digit ohms to tens of ohms) — compare to manufacturer spec
  • No-load current: measurable when pump commanded; unusually high current suggests internal short or seizure

Diagnostic algorithm

  1. Connect a scan tool, read freeze frame and live data, and confirm P023C is active (not historical)
  2. Visually inspect pump, harness, and connectors for damage, corrosion, or signs of overheating; repair as needed
  3. Check and record battery voltage with ignition ON and while pump is commanded to run
  4. With harness disconnected, measure resistance of the pump motor to ground and between supply and control pins; compare to spec — very low resistance or short to chassis indicates internal pump fault
  5. Backprobe the pump connector while commanding the pump ON; verify the control line voltage and/or PWM signal and ground are within expected ranges
  6. If control line is high when pump is OFF, inspect for short to battery on control wiring; if control line is high when commanded ON but pump does not run, check ground or motor condition
  7. Perform continuity and short-to-power/short-to-ground checks on wiring between pump and ECM/relay with connector disconnected; repair wiring as necessary
  8. Swap or bench-test relay (if applicable) and inspect associated fuses; replace suspect relay/fuse
  9. If wiring, connectors, relay, and pump check good, consider ECM or pump driver module fault — consult manufacturer service information before replacing ECM
  10. After repairs, clear codes, perform a functional test of the pump under all conditions, and verify no return of the code

Likely causes

  • Shorted power feed or switched supply to the pump control line
  • Failed pump motor with internal short to supply
  • Corroded connector causing intermittent high resistance and voltage spikes
  • Damaged wiring harness contacting chassis or other power conductors
  • Faulty relay or fuse supplying pump circuit

Fault status

⚠️ Status
Control circuit for Charge Air Cooler Coolant Pump A is reporting a voltage/signal above the expected range. ECM stored P023C and may inhibit or alter pump operation until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0627 P0628 P0480 P023B P0299
266

Browse 266 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 .