8/4/25, 8:59 AM

TOPIx - SSM76361 - Intermittent Low Coolant Warning Displayed But Coolant Level OK

Reference

SSM76361

Models

New Range Rover / L460
New Range Rover Sport / L461

Title

Intermittent Low Coolant Warning Displayed But Coolant Level OK

Category

Engine

Last modified

11-Jul-2025 00:00:00

Symptom

402000 Cooling System Concerns

Attachments

Attachment 15.PNG (Attachment 15.PNG)
Attachment 25.PNG (Attachment 25.PNG)

Content

Model / Model Year / Derivative
Range Rover / 22MY Onwards / All Engine Derivatives
Range Rover Sport / 23MY Onwards / All Engine Derivatives
Situation:
JLR Engineering investigations have identified that some vehicles may intermittently display a low coolant level warning on the
instrument cluster, even though the coolant level is confirmed to be within the correct range and no cooling system leaks are evident.
Cause:
The cause is currently under investigation with the relevant Engineering teams and actions completed within this SSM will help identify
the root cause.
Action:
1. Connector Inspection – C1MC21A
Locate the coolant level sensor connector C1MC21A (refer to Attachment 1).
Visually inspect the connector for signs of water ingress and/or corrosion.
Take a clear, in-focus photograph of the connector to document its condition.
2. Pin Retention Check – C1MC21A

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8/4/25, 8:59 AM

TOPIx - SSM76361 - Intermittent Low Coolant Warning Displayed But Coolant Level OK

Perform a pin retention (pin tension) check on both cavities of connector C1MC21A.
Record the results, noting any signs of loose, damaged, or misaligned terminals.
3. Wiring Harness Inspection
Inspect the wiring harness leading from connector C1MC21A for any signs of physical damage, such as chafing, abrasion, or
incorrect routing.
If damage is found, take a clear, in-focus photograph for evidence.
4. Ground Point Inspection – G1D830A
Locate ground point G1D830A (refer to Attachment 2).
Confirm that the ground point is clean, secure, and free from corrosion.
Take a clear, in-focus photograph of the ground point to document its condition.
5. Continuity Test – Sensor to Ground
Using suitable calibrated measuring equipment, measure the resistance between Pin 1 of connector C1MC21A and ground point
G1D830A.
Record the measured resistance. The expected value should be less than 0.5 ohms to confirm good continuity.
6. Coolant Level Sensor Function Test
Using suitable calibrated measuring equipment, measure the resistance across the terminals of the coolant level sensor with the
coolant expansion tank both full and empty.
Record the resistance values for both conditions to confirm correct sensor function.

Raise a Technical Assistance (TA). The TA must include the following information:
Reference the following engineering department: ‘PTS_500’
Reference to this SSM number (SSM76361)
Reference to P374537
Photographic evidence where requested
Recorded measurements taken during the previous steps
Reported observations from the customer detailing the timing and conditions of the low coolant level warning illumination (frequency
of warning activation, drive cycle information, engine temperature).
A JLR Engineer will review the TA case and provide further guidance.
(REF:000374537/5864)
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