B10EA

Code

LAND ROVER B — Body

Positive temperature coefficient heater

Brand: LAND ROVER

Type: B — Body

Views: UK: 12 EN: 23 RU: 23

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Page language: EN

Causes

Open or shorted PTC heater element
Broken, corroded or disconnected wiring/connector to the heater
Blown fuse or faulty relay in the heater supply circuit
High resistance in connector or ground causing poor current flow
Faulty control module or heater driver (HVAC module, battery thermal management module)
Incorrect supply voltage (weak battery, charging system problem)

Symptoms

DTC stored and possibly MIL / warning lamp illuminated
Reduced or no auxiliary heating (slow warm-up or no cabin heat)
HV/auxiliary heater does not turn on when commanded
Unusual electrical load on the battery (higher than normal current draw) or fuse blowing
Related thermal management warnings (battery/coolant temperature incorrect)

What to check

Read stored codes and freeze-frame data with a capable scan tool; clear and re-check
Visually inspect heater assembly, wiring harness, connectors and grounds for damage, corrosion or water ingress
Check relevant fuses and relays for continuity and correct operation
Measure supply voltage at the PTC heater connector with key on / heater commanded
Measure heater element resistance (cold) and compare to service information or expected low-ohm range
Use a current clamp or diagnostic function to measure heater current during activation

Signal parameters

Supply voltage at heater connector: should be close to battery voltage for 12V systems (check vehicle spec)
Heater element DC resistance (cold): low-ohm value — compare to service data; open circuit indicates break
Operating current when heater is commanded: several amps for PTC elements in 12V systems (use clamp meter or diagnostic current reading)
Control signal: on/off or PWM duty cycle from controller — verify presence when heater commanded
Temperature feedback: heater/ambient sensor value should change when heater runs (if applicable)
Fuse continuity and relay coil supply voltage when commanded

Diagnostic algorithm

Retrieve the code and any related codes; record freeze-frame or data parameters. Note vehicle configuration (12V/48V/hybrid).
Inspect visible wiring, connectors and heater assembly for physical damage, corrosion, water ingress or overheating.
Verify fuses and relays in the heater supply and control circuits; replace if blown or faulty and retest.
With vehicle key on and heater commanded (use scan tool actuator test if available), measure supply voltage at heater connector and confirm control signal at module output.
Measure heater element resistance with power removed. An open circuit indicates a failed element; a short to ground indicates internal failure.
Measure current draw during activation. Compare to expected range from service data; abnormally high or low current indicates element or wiring problem.
Wiggle test wiring and connectors while monitoring voltage/current to identify intermittent faults.
If wiring and heater check good, verify module operation and communications. Check for diagnostic outputs from the module and update software if advised by technical bulletins.
If heater element is confirmed faulty, replace the PTC heater assembly following manufacturer procedure. Re-test and clear codes; perform final road/functional test.
Safety note: If the system is high-voltage (hybrid/EV), do not attempt HV testing or component removal unless qualified and following HV isolation procedures.

Likely causes

Damaged wiring or poor connector ground at the heater
Failed PTC heater element (open or short)
Blown fuse or failed relay supplying the heater
Control module / driver fault or corrupted software

Fault status

⚠️ Status

PTC heater circuit fault detected — reduced or no auxiliary heating. See service manual for circuit and component details.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

Manual library for LAND ROVER

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

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