P1635 [Solved]
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Joined: Apr 2016
Posts: 157
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From: Leominster Massachusetts
P1635 [Solved]
P1635 - 5 volt reference # 1 circuit
Accompanied by P0522.
This is one with limited posts and not many people close out with results. So I figured I’d post my experience with it.
7/20/2022 my c5 z06 was getting tuned. A very hot day. Fortunately the tuner was able to flash the car with a solid tune at 10psi right before the car had an issue; preventing us from turning the car up any farther.
When the issue started - Upon startup, the vehicle would idle Extremely rough and barely run. Non-responsive to throttle input. NOT showing any type of limp mode on the dash. The tuner pulled the aforementioned codes.
Before the car arrived home by flatbed, I had a little time to do some research. I had planned to use the (attached) document to diagnose the vehicle. But before I started really digging into the car, I wanted to psychically look at the oil pressure sensor and wiring.
A previous owner cut a hole in the fiberglass panel beneath the wiper cowl, for easy access to the MAP and OPS. So I removed the wiper cowl and found that the three wires for the OPS sensor had melted together.
I unplugged the sensor and the problem completely went away. I plan to install an aftermarket OPS gauge and insulate the wires with DEI wire sleeve.
Good luck!
Accompanied by P0522.
This is one with limited posts and not many people close out with results. So I figured I’d post my experience with it.
7/20/2022 my c5 z06 was getting tuned. A very hot day. Fortunately the tuner was able to flash the car with a solid tune at 10psi right before the car had an issue; preventing us from turning the car up any farther.
When the issue started - Upon startup, the vehicle would idle Extremely rough and barely run. Non-responsive to throttle input. NOT showing any type of limp mode on the dash. The tuner pulled the aforementioned codes.
Before the car arrived home by flatbed, I had a little time to do some research. I had planned to use the (attached) document to diagnose the vehicle. But before I started really digging into the car, I wanted to psychically look at the oil pressure sensor and wiring.
A previous owner cut a hole in the fiberglass panel beneath the wiper cowl, for easy access to the MAP and OPS. So I removed the wiper cowl and found that the three wires for the OPS sensor had melted together.
I unplugged the sensor and the problem completely went away. I plan to install an aftermarket OPS gauge and insulate the wires with DEI wire sleeve.
Good luck!
