THE CODE DIRECTORY

Diagnostic code references — Page 35.

Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.

Generic OBD-II

P0B34

These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

High Voltage Service Disconnect Circuit Performance

High Voltage Service Disconnect Circuit Low

High Voltage Service Disconnect Circuit High

High Voltage Service Disconnect Open

Motor Electronics Coolant Pump B Control Circuit/Open

Motor Electronics Coolant Pump B Control Circuit Low

Motor Electronics Coolant Pump B Control Circuit High

battery sense channel A needs an open-line investigation

Block-one voltage is scaled and compared with the whole pack

The first battery block has a direct low-signal check

Block-one circuit high is a signal-limit event, not a charging diagnosis

Hybrid/EV Battery Voltage Sense A Circuit Intermittent/Erratic

zero battery readings do not automatically mean dead cells

Block-two rationality also depends on the block-three comparison

The block-two low monitor requires block three to be low as well

Block-two high voltage is evaluated without the paired low condition

Hybrid/EV Battery Voltage Sense B Circuit Intermittent/Erratic

sense circuit C should be read alongside adjacent channels

Blocks three and four are both part of the block-three plausibility test

A low block-three report includes the block-four signal

Block-three circuit high checks the named input directly

Hybrid/EV Battery Voltage Sense C Circuit Intermittent/Erratic

busbar sensing and cell condition must be separated

Block-four plausibility includes a second comparison using block five

The block-four low-limit check also watches block five

Block-four high sensing is a single-channel upper-limit test

Hybrid/EV Battery Voltage Sense D Circuit Intermittent/Erratic

sense channel E needs valid module communication first

Block-five rationality continues across a page boundary and includes block six

Block-five circuit low requires a matching low block-six indication

The block-five upper sensing limit does not depend on block six

Hybrid/EV Battery Voltage Sense E Circuit Intermittent/Erratic

sense circuit F uses a sustained open-detection window

Block-six rationality has a source-label discrepancy in its validity condition

Block-six low sensing is qualified by block seven as well

Block-six circuit high evaluates one upper signal limit

Hybrid/EV Battery Voltage Sense F Circuit Intermittent/Erratic

cell-balancing faults can prevent a valid sense-G evaluation

battery block 7 plausibility depends on the pack-voltage comparison

why a block 7 low reading must be considered with block 8

a high block 7 signal is not the same as pack overvoltage

Hybrid/EV Battery Voltage Sense G Circuit Intermittent/Erratic

sense-H readings need the controller test state recorded

block 8 rationality needs two sustained comparison errors

two low block readings define this circuit H diagnosis

block 8 high-voltage sensing versus a rationality fault

Hybrid/EV Battery Voltage Sense H Circuit Intermittent/Erratic

sense circuit I is a channel label, not a pack replacement order

block 9 performance cannot be judged from one voltage alone

the block 9 low-range test includes block 10

a repeated high block 9 measurement requires source-aware diagnosis

Hybrid/EV Battery Voltage Sense I Circuit Intermittent/Erratic

sense-J diagnosis continues the shared open-line monitor

block 10 rationality compares two scaled readings with the pack

block 10 and block 11 must both satisfy the low-reading rule

block 10 high sensing uses a direct range threshold

Hybrid/EV Battery Voltage Sense J Circuit Intermittent/Erratic

common sensing power can affect the circuit-K voltage pattern

block 11 performance is a comparison diagnosis

block 11 low voltage is evaluated with the next block

interpret block 11 high as a measurement finding

Hybrid/EV Battery Voltage Sense K Circuit Intermittent/Erratic

Battery voltage sense L has excessive calculated resistance

block 12 rationality requires the block 13 comparison too

a circuit L low report is based on two block values

block 12 high sensing has its own filtered threshold

Hybrid/EV Battery Voltage Sense L Circuit Intermittent/Erratic

sense-M fault needs the exact pack channel map

block 13 plausibility involves block 14 and pack voltage

block 13 low sensing should be checked as a paired event

block 13 high-voltage sensing needs repeated evidence

Hybrid/EV Battery Voltage Sense M Circuit Intermittent/Erratic

sense-N verification must show a valid completed monitor

block 14 rationality extends across two source pages

block 14 low sensing includes the block 15 report

the block 14 high branch is a direct range check

Hybrid/EV Battery Voltage Sense N Circuit Intermittent/Erratic

sense-O readings must be distinguished from actual cell voltage

block 15 plausibility relies on neighboring and total-pack data

block 15 low requires evidence from block 16 as well