P0B73Hybrid/EV Battery Voltage Sense L Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Channel L delivers a value, but P0B73 tells you that the value is not credible. GM checks this in three ways. The 2016 Chevrolet Volt and the 2019 lithium-ion systems test whether cell L moves in the same direction as the average once that average changes by more than 0.022 V, failing 7 of 8 seconds or 35 of 40 samples respectively, Type A. The BAS Plus mild hybrid demands at least half of the average movement, 20 of 40 samples, Type B. The 2012 two-mode trucks treat L as nickel-metal hydride block 12 and compare blocks 12 and 13, scaled by twenty, with the pack voltage, failing beyond 70 V in 160 of 170 samples, Type B. A battery controller reflash or measuring board repair is the usual remedy.
- What you may notice
- MIL with normal driving behaviour
- Reduced electric range or assist
- Likely causes
- LikelyChannel L input not following real cell voltage changes
- PossibleBattery controller software or calibration issue
- RareCorroded cell tap slowing the signal
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.