P2A82: Alternative Fuel Pump A Compression Stroke Valve Control Circuit High

P2A82 shows the drive line to pump A's compression stroke valve at a higher level than the commanded state permits, most likely because the coil winding or its wire is broken where the valve is switched to ground, or because the line touches battery voltage and the output stage loses control of it. The solenoid then cannot move the spool into the fill position, so oil never reaches the drive side and pump A performs no compression stroke at all. Gas pressure downstream of the pump sinks faster than the controller expects, and on a single-element system the engine soon runs short of fuel. Caterpillar's patents show the spool going back to drain when the solenoid is de-energized, which is the state this fault produces. No manufacturer publishes P2A82. Measure coil resistance and feed voltage.

High severity. Can I keep driving?If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.

Symptoms

Warning lamp on
Falling gas pressure and power loss
Engine may stall on gas with a single pump element

Most likely causes

Open coil or broken wire at valve A
Control wire shorted to battery voltage
Corroded valve connector

What to check, in order

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

If you smell gas, shut off the supply, ventilate and do not start the engine
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Read the codes with a compatible scanner
Check the connectors and wiring of the component indicated
Leave any work on the gas circuit to an authorized shop

Good to know

Repair difficulty: hard
It can trigger limp mode.
It affects emissions.

What each character of P2A82 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
A: Hybrid or air and fuel
82: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2A82?

If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.

What causes code P2A82?

The most common causes are: open coil or broken wire at valve A; control wire shorted to battery voltage; corroded valve connector.

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.