B1318 on Volvo EX90
Factory diagnostic protocol and troubleshooting wire for fault code B1318 specifically for the Volvo EX90 (2024–2026, Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh)).
1. Symptoms of B1318 on Volvo EX90
When the Engine Control Module (ECM/PCM) on your Volvo EX90 (Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh)) logs fault code B1318, drivers commonly observe:
2. Most Likely Causes on Volvo EX90
Historical warranty claims and technical repair bulletins for Volvo EX90 point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Volvo EX90
Measure resting battery voltage with engine off. Normal is 12.6V. If under 12.0V, battery is discharged. on the Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
Remove corrosion with baking soda solution and wire brush, tighten terminal clamps firmly. on the Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
Start engine and measure voltage across battery. Normal charging voltage is 13.8V to 14.6V. If below 13.0V, alternator has failed. on the Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
Install new high-CCA AGM or flooded battery, or replace alternator. on the Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
Clear DTCs and perform Battery Management System (BMS) reset if equipped. on the Volvo EX90 equipped with Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh).
Equipment for Diagnosing Volvo EX90 (B1318)
Volvo EX90 OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Volvo EX90.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
Other Common Fault Codes on Volvo EX90
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Volvo EX90:
4. Volvo EX90 B1318 FAQs
What causes code B1318 to trigger on a Volvo EX90?
On the Volvo EX90 (Twin Motor AWD EV (402HP / Performance 510HP / 111 kWh)), B1318 is most frequently caused by Failing 12V automotive battery (sulfated plates or dead cell) or Faulty alternator not charging battery (>13.5V).
Where is the OBD-II port located on my Volvo EX90?
On the Volvo EX90, the 16-pin DLC diagnostic connector is located Driver footwell lower OBD interface. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Volvo EX90 with code B1318?
Caution. Low voltage (<10V) causes random module dropouts, flickering dash lights, and stalling. Given that B1318 carries a Medium severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.