B1318 on RAM 1500
Factory diagnostic protocol and troubleshooting wire for fault code B1318 specifically for the RAM 1500 (2020–2026, 3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar).
1. Symptoms of B1318 on RAM 1500
When the Engine Control Module (ECM/PCM) on your RAM 1500 (3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar) logs fault code B1318, drivers commonly observe:
2. Most Likely Causes on RAM 1500
Historical warranty claims and technical repair bulletins for RAM 1500 point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for RAM 1500
Measure resting battery voltage with engine off. Normal is 12.6V. If under 12.0V, battery is discharged. on the RAM 1500 equipped with 3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar.
Remove corrosion with baking soda solution and wire brush, tighten terminal clamps firmly. on the RAM 1500 equipped with 3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar.
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 RAM 1500 equipped with 3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar.
Install new high-CCA AGM or flooded battery, or replace alternator. on the RAM 1500 equipped with 3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar.
Clear DTCs and perform Battery Management System (BMS) reset if equipped. on the RAM 1500 equipped with 3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar.
Equipment for Diagnosing RAM 1500 (B1318)
RAM 1500 OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for RAM 1500.
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 RAM 1500
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the RAM 1500:
4. RAM 1500 B1318 FAQs
What causes code B1318 to trigger on a RAM 1500?
On the RAM 1500 (3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar), 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 RAM 1500?
On the RAM 1500, the 16-pin DLC diagnostic connector is located Driver lower knee bolster panel to the right of parking brake. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my RAM 1500 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.