Diagnose check engine light (fault indicator) on the 2024 Rivian EDV 500 electric delivery van using OBD-II diagnostics and electric vehicle-specific troubleshooting procedures.

Warnings

Tools required

Parts

• High voltage connector seals × 1 — Use OEM specification
• HV system service plug × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Ensure vehicle is in Park mode and powered off
3. Verify 12V auxiliary battery is fully charged (low 12V battery can cause false fault codes)
4. Document all visible warning lights and driver-reported symptoms
5. Check for any recent software updates or technical service bulletins related to reported symptoms
6. Ensure diagnostic equipment is updated with latest Rivian EDV software definitions
7. Put on high voltage safety gloves if HV system diagnosis will be required

Procedure

1. 1

   Connect diagnostic equipment and retrieve fault codes
   Locate the OBD-II diagnostic port under the driver-side dashboard. Connect the scan tool and power on the vehicle to accessory mode (do not engage Ready mode yet). Perform a full system scan to retrieve all diagnostic trouble codes (DTCs) from all modules including powertrain, battery management system (BMS), motor controllers, charging system, and body control modules. Document all codes, freeze frame data, and pending codes. Pay special attention to codes in the HV battery module and motor inverter modules.
2. 2

   Analyze fault codes and identify affected systems
   Review all retrieved DTCs and cross-reference with Rivian service information. Identify which system is affected: HV battery pack, front motor/inverter, rear motor/inverter, DC-DC converter, onboard charger, thermal management system, or auxiliary systems. Prioritize codes by severity (Type A/B/C). Note any multiple codes that may indicate a common root cause such as a communication fault, sensor issue, or cooling system problem. Check if codes are current, pending, or historical.
3. 3

   Verify fault code conditions and reproducibility
   Clear any historical or non-critical codes after documenting them. With scan tool connected in live data mode, attempt to reproduce the fault condition by activating the vehicle to Ready mode. Monitor relevant parameters such as battery pack voltage, individual cell voltages, motor temperatures, inverter temperatures, coolant temperatures, isolation resistance, and insulation monitoring values. Drive or operate the vehicle if safe to do so to recreate the original fault condition. Note if the check engine light returns immediately or under specific operating conditions.
4. 4

   Perform high voltage system safety check
   If codes indicate HV system involvement, power down the vehicle completely and remove the HV service disconnect plug located in the rear cargo area (consult service manual for exact location on EDV 500). Wait 5 minutes for capacitor discharge. Use a multimeter to verify zero voltage at HV disconnect points before proceeding. Inspect HV service plug for damage, corrosion, or wear. Check all visible orange HV cables for damage, chafing, or connector looseness. Verify HV interlock loop continuity if vehicle is equipped with accessible interlock test points.
5. 5

   Inspect battery pack and thermal management system
   If codes relate to battery management system (P0xxx or U0xxx series), inspect the battery pack exterior for any signs of damage, leakage, or swelling. Check battery coolant level in the reservoir (if accessible) and inspect for leaks in coolant lines. Monitor individual cell voltage balance using diagnostic software - variation greater than 50mV between cell groups may indicate cell degradation or BMS calibration issues. Check battery pack temperature sensors and heater operation if codes indicate thermal management faults. Inspect cooling pump operation and listen for unusual noises.
6. 6

   Test motor and inverter systems
   For motor-related codes (often C-series or P0Axx codes), inspect front and rear motor inverter assemblies for coolant leaks, connector security, and physical damage. Use thermal imaging to identify any abnormal hot spots on inverter housing or motor housing that could indicate internal failures. Check motor resolver or encoder signals using scan tool live data - erratic position signals indicate sensor failure. Verify motor isolation resistance meets specifications (typically >100 megohms). Test inverter gate driver circuits if diagnostic software provides this capability.
7. 7

   Evaluate charging and DC-DC converter systems
   If codes relate to charging system (U0xxx or P1xxx series), inspect the onboard charger module and DC-DC converter for proper connections and cooling. Check 12V auxiliary battery voltage and load test - weak 12V battery causes numerous false codes. Verify DC-DC converter output voltage (should maintain 13.5-14.5V when vehicle is in Ready mode). Inspect charging port contacts for damage or debris. If vehicle has charge faults, attempt to charge from a known-good EVSE and monitor charge parameters via diagnostic software.
8. 8

   Check sensor inputs and communication networks
   For communication codes (U0xxx series) or sensor codes (P0xxx, C0xxx), inspect all relevant connectors for corrosion, bent pins, or water intrusion. Check CAN bus termination resistance at diagnostic port (should read approximately 60 ohms across CAN High and CAN Low with vehicle powered off). Verify sensor power supply voltages (typically 5V or 12V reference). Test specific sensors implicated by codes: coolant temperature sensors, accelerator pedal position sensors, brake pressure sensors, current sensors. Use wiring diagrams to trace circuits if open or short circuit codes are present.
9. 9

   Perform component-specific tests based on diagnosis
   Based on fault code analysis, perform targeted testing of the identified faulty component. This may include: resistance testing of motor windings, insulation testing of HV cables, functional testing of contactors and relays, bench testing of sensors, or pressure testing of coolant systems. Compare all measurements against Rivian factory specifications. If a component is confirmed faulty, note the part number and prepare for replacement. If measurements are within specification but codes persist, suspect control module calibration issues or software bugs.
10. 10

    Review technical service bulletins and software updates
    Access Rivian service portal or contact Rivian technical support to check for any technical service bulletins (TSBs) related to the specific fault codes encountered. Verify vehicle software version and check if updates are available that address the diagnosed issue. Many electric vehicle faults are resolved through software calibration updates rather than hardware replacement. Document the current software versions of all relevant control modules. Schedule software updates if applicable and available.
11. 11

    Clear codes and verify repair
    After identifying and addressing the root cause (whether component replacement, connector repair, or software update), clear all diagnostic trouble codes from all modules. Reinstall HV service disconnect plug if it was removed. Cycle vehicle power off and on. Activate vehicle to Ready mode and verify check engine light remains off. Perform a complete drive cycle including: city driving, highway driving, regenerative braking, and acceleration events to allow all monitors to complete. Re-scan for codes after drive cycle to confirm no codes return.
12. 12

    Document findings and create repair order
    Document all findings including: original fault codes, diagnostic steps performed, test results, components tested, parts replaced, software versions before and after updates, and final verification results. Include freeze frame data and any relevant live data screenshots. Note any deferred repairs or items requiring customer approval. Update vehicle service history with complete diagnostic narrative. If issue could not be resolved, document all attempted diagnostic steps and recommendations for escalation to Rivian engineering or field service support.

Reassembly

1. Ensure all HV connectors are properly seated and locked with audible click
2. Reinstall any removed covers or access panels
3. Verify HV service disconnect plug is fully installed and locked
4. Confirm all diagnostic connections are removed before returning vehicle to customer
5. Reset any vehicle systems that were disabled during diagnosis

Verification

• Check engine light is off and remains off during complete drive cycle
• No diagnostic trouble codes present in any vehicle modules
• All vehicle readiness monitors show complete status
• Vehicle operates normally under all driving conditions including acceleration, regenerative braking, and highway speeds
• HV battery state of charge displays correctly and charging functions normally
• All driver information displays show normal operating parameters
• 12V auxiliary battery maintains proper voltage with vehicle in all power modes
• Customer confirms original symptom is resolved

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