P0E45: Hybrid/EV Battery Pack Voltage Sense E Circuit Range/Performance

P0E45 says pack voltage measurement E delivers a value that is electrically valid but does not fit the rest of the battery data. Such a rationality test usually compares the channel with the summed block or cell voltages, or with a second pack measurement. No manufacturer documents P0E45 publicly. GM's 2013 two-mode hybrid trucks (Tahoe, Yukon, Escalade, Silverado, Sierra) show the method on channel A: their battery pack control module fails P0ABB once the gap between pack voltage and the added-up block voltages exceeds 50 V in 70 of 80 checks taken every 100 ms, Type A, one trip. CARB requires plausibility monitoring for battery voltage sensors. Circuit, low, high and erratic faults of channel E are P0E44, P0E46, P0E47 and P0E48. Battery power is usually limited.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

Warning light with reduced hybrid or electric power
Displayed state of charge or range jumps unexpectedly

Most likely causes

Corroded or loose sense connection adding resistance and skewing the reading
Drifting measuring stage or outdated software in the battery controller
Fault in the reference value, e.g. a block or cell voltage channel

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Compare the reading with other engine data while varying the engine speed.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

It can trigger limp mode.
It affects emissions.

What each character of P0E45 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
E: Subsystem depends on the code range
45: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0E45?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0E45?

The most common causes are: corroded or loose sense connection adding resistance and skewing the reading; drifting measuring stage or outdated software in the battery controller; fault in the reference value, e.g. a block or cell voltage channel.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.