P1626

Code

LAND ROVER P — Powertrain

Air conditioning - open circuit with battery with positive power

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 15 EN: 21 RU: 19

AI status

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Page language: EN

Causes

Blown A/C or system fuse
Faulty A/C compressor clutch or clutch coil open
Faulty A/C compressor relay or relay socket damage
Open or broken wiring on the B+ feed or switched positive feed to the A/C circuit
Corroded/loose connectors at fusebox, relay or compressor
Faulty body/control module output (BCM/PCM) or incorrect module software

Symptoms

A/C compressor/clutch does not engage
Reduced or no cooling from HVAC system
A/C compressor relay clicking or no click at all
Associated instrument panel A/C warning or loss of function
DTC stored (P1626) and possibly related voltage codes

What to check

Read and document all stored codes and freeze frame data with a capable scan tool
Confirm battery voltage and battery health (check for low voltage conditions)
Inspect fuses and relays related to A/C power in fusebox and under-hood power distribution
Visually inspect wiring harnesses and connectors for damage, corrosion, or disconnection at relay, fusebox and compressor
Check for service bulletins or software updates for the vehicle and climate module

Signal parameters

Battery voltage at rest and key ON: ~12.0–14.5 V (record exact values)
When A/C request is made: B+ supply to A/C relay coil or compressor feed should show battery voltage (approx battery V)
A/C compressor clutch coil resistance typically in the range of ~2–6 ohms (consult vehicle service manual for exact spec)
Control module output (relay control) should show switched ground or 12 V depending on design when request is active (use schematic to verify expected signal)

Diagnostic algorithm

Connect a scan tool, record P1626 and any accompanying codes, clear codes and attempt to re-create the fault
Verify battery voltage and charging system — charge/replace battery if low or unstable
Locate the A/C power/relay circuit on the vehicle wiring diagram; identify fuse, relay, and connector locations
Visually inspect fuses and relay(s); remove and test/replace suspect relay and fuse
With ignition ON and A/C requested, measure for battery positive at the fused feed and at relay input; verify continuity from fuse to relay input
Measure voltage at the relay output/compressor feed with A/C requested; if no B+ at output but present at input, replace relay and retest
Check continuity between relay output and compressor connector for an open circuit; repair any open wiring/connector faults found
Measure compressor clutch coil resistance at the connector (with circuit disconnected) and compare to spec; replace compressor if coil open
If wiring and components are good, check control module output (relay drive) per wiring diagram — if module output is missing, consider module diagnostics or reprogramming
After repairs, clear codes and perform functional test of A/C; verify code does not return and system operates normally

Likely causes

Blown or intermittent fuse protecting A/C feed
Open conductor between battery/relay and A/C clutch or relay coil
Damaged relay or relay contacts not passing B+
Disconnected/poor connector at compressor or relay
Compressor clutch coil failed open

Fault status

⚠️ Status

Open-circuit detected on the air conditioning positive supply circuit (battery/switched B+). The control module is not detecting the expected B+ on the A/C power feed — the compressor/relay may not receive power.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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P1626 — Air conditioning - open circuit with battery with positive power