B2946

Code

LAND ROVER B — Body

RF receiver power - short circuit to ground

Brand: LAND ROVER

Type: B — Body

Views: UK: 3 EN: 6 RU: 5

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or chafed power wire contacting chassis ground
Corroded, bent or pushed‑out connector pins creating a low‑impedance path to ground
Failed internal RF receiver module (internal short)
Aftermarket alarm/remote installation incorrectly tapped into power circuit
Water/moisture ingress into connector or module
Previous poor repair or pinched wiring harness

Symptoms

Remote key fob/unlock/lock functions inoperative or intermittent
Keyless entry / remote start will not operate
Associated fuse for RF receiver blown or repeatedly blows
Possible increased parasitic battery drain
DTC present in vehicle diagnostics and repeated after clearing

What to check

Retrieve DTCs and any freeze‑frame data with a diagnostic scanner
Visual inspection of RF receiver, connector and wiring harness for damage, corrosion, or water ingress
Check related fuses and replace if blown; note if fuse blows again
Backprobe the RF receiver power pin and measure voltage with ignition/accessory and with module connected/disconnected
Measure resistance/continuity between RF receiver power wire and chassis ground with harness disconnected
Unplug the RF receiver module and see if the DTC clears or if fuse still blows

Signal parameters

Expected voltage on RF receiver power feed: battery voltage approximately 12.0–14.5 V (vehicle off/ignition states per manufacturer)
Normal resistance between power feed and chassis ground: high (kΩ range); a true short typically measures very low (
Quiescent current for the circuit should be very low when vehicle is asleep (vehicle‑specific; typically
If fuse blows immediately when power applied, suspect direct short to ground

Diagnostic algorithm

Read and record all stored DTCs and freeze‑frame data. Confirm code B2946 and note any related codes.
Visually inspect RF receiver module, connector, wiring runs and entry points (doors, grommets) for damage, abrasion or moisture. Inspect for aftermarket taps.
Check the RF receiver fuse. Replace blown fuse and observe: if it blows immediately, proceed carefully to locate a short before further replacements.
With ignition per service manual, backprobe the RF receiver power pin and confirm presence/absence of battery voltage. NOTE: follow manufacturer safety/battery isolation procedures when required.
Disconnect the RF receiver connector. Clear the code and attempt to reproduce or re‑scan. If the code does not return with the module disconnected and fuse no longer blows, suspect internal module short.
With connector disconnected, measure resistance between the power feed wire and chassis ground. Low resistance indicates a wiring short between that connector and ground. If resistance is high, the module is likely faulty.
If wiring short is indicated, isolate by disconnecting downstream connectors/splices or using a fused test lamp/current tracer to localize the short. Repair damaged wiring, replace grommets, and clean/repair corroded connectors.
If the receiver is determined faulty, replace only with a correctly specified OEM or approved replacement and program if required by the manufacturer.
After repair or replacement, clear DTCs, verify operation of remote functions, recheck fuses and verify no parasitic drain. Road/test as required and rescan to ensure the fault does not return.

Likely causes

Power feed conductor shorted to chassis ground at a harness splice, grommet or connector
Corrosion or foreign material in RF receiver connector creating a ground path
Internal failure inside the RF receiver module causing low resistance to ground
Incorrectly installed aftermarket device tied into the receiver supply

Fault status

⚠️ Status

RF receiver power circuit detected short to ground; power feed is low impedance to ground causing loss of RF receiver function.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–2.0 hours

Similar codes

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

B2946 — RF receiver power - short circuit to ground