Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P1629 — Front entry of the generator on the right failure

P1629 — Front entry of the generator on the right failure

Detailed page for trouble code P1629.

35,619codes
59brands
11,925generic
23,694specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P1629

LAND ROVER P — Powertrain

Front entry of the generator on the right failure

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

Causes

  • Corroded, loose or damaged connector/terminal at the front right of the alternator
  • Broken, chafed or shorted wiring in the alternator harness (open, short to ground or short to battery)
  • Failed alternator internal components (rectifier, regulator, stator/field)
  • Poor ground at alternator or engine block
  • Blown fuse or faulty charging-system relay
  • Faulty body/engine control module or BCM that monitors/controls generator

Symptoms

  • Battery warning/charge lamp illuminated on dash
  • Battery not charging or low system voltage (battery drains)
  • Intermittent charging or flickering dash lamps
  • Difficult starting or no-crank if battery becomes discharged
  • Reduced electrical performance (dimming lights, ECU warnings)
  • Possible smell of burning or melted insulation near alternator

What to check

  • Read stored freeze-frame and related codes with a capable scan tool; note voltage data and occurrence conditions
  • Inspect the right-side alternator connector and harness for corrosion, bent pins, water ingress, heat damage or loose terminals
  • Check fuses and relays in the charging and engine circuits
  • Measure battery voltage with engine off and engine running (expect ~12.4–12.8 V off, ~13.5–14.8 V running)
  • Check continuity/resistance of B+ and ground leads between alternator and battery/ground (look for high resistance)
  • Perform wiggle/pressure test on the harness while monitoring voltage/charging to reproduce the fault

Signal parameters

  • Battery voltage (engine off): ~12.4–12.8 V expected
  • Charging voltage (engine running, no load): ~13.5–14.8 V expected
  • B+ terminal continuity: near 0 Ω between alternator B+ and battery positive (very low resistance)
  • Field/control terminal voltage: may be 0–12 V or PWM signal when regulator is commanded (use oscilloscope to check duty/frequency on PWM-controlled alternators)
  • Diode/rectifier ripple: low AC ripple on DC output (excessive ripple indicates failed diodes)
  • Connector pin voltages: battery feed and control lines should match expected values from wiring diagram

Diagnostic algorithm

  1. Retrieve P1629 and any other stored codes; record freeze-frame data and voltage readings.
  2. Visually inspect the front-right alternator entry area: connector housing, seals, pins, and nearby harness for damage or corrosion. Repair any obvious issues.
  3. Check and verify battery state-of-charge and terminal condition. Ensure battery is charged and in good condition before further testing.
  4. With a DVOM, measure battery voltage at battery posts (engine off) and at alternator B+ with engine running. Confirm charging voltage (13.5–14.8 V).
  5. Inspect fuses/relays for the charging/IGN circuits and replace if faulty; verify power feed to alternator connector pin(s).
  6. Probe alternator connector: verify B+ present, verify ground continuity, and monitor regulator/field/control pin for expected DC/PWM signal. Use oscilloscope if available to inspect PWM.
  7. Perform continuity/resistance checks on harness from connector to battery/ground and back-probe pins to check for intermittent connections. Repair/replace wiring where resistance is high or intermittent.
  8. Check alternator internal diodes and winding resistances (follow OEM procedure); if diodes/regulator out of spec, consider alternator replacement or overhaul.
  9. If wiring and alternator bench tests OK, verify BCM/ECM control outputs and module power/ground; swap module only after module-level diagnosis.
  10. After repair, clear codes, perform a charging system verification and road test to confirm repair. Re-scan for reappearance of P1629.

Likely causes

  • Corrosion or bent pins in the right-side alternator connector
  • Intermittent contact due to a damaged connector retainer or broken wire near the connector
  • Regulator or diode/rectifier failure inside the alternator
  • Poor ground strap between alternator/engine and chassis
  • Fuse/relay for the charging circuit blown or intermittent

Fault status

⚠️ Status
Generator front-right entry fault detected — connector/circuit fault at the alternator right-side entry. Charging system integrity may be compromised.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0620 P0627 P0628 P0562 P2503
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

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 .