Which motorcycles does code 19-01 apply to?

It is documented here for the Honda CBR600RR (2003-2006). Other Honda models may use the same display code with a different meaning, so confirm against your model.

Can I still ride with code 19-01?

It depends on the fault. Code 19-01 relates to the CKP (crankshaft position) sensor. If the bike runs poorly or a safety-related system is affected, avoid riding until it is checked. The FI light stays on until the fault is fixed and the codes are cleared.

19-01 Strongly inferred

CKP sensor no signal

The ECU saw no crankshaft-position signal when it expected one. This is the standard Honda meaning for the code.

Manufacturer: Honda
Platform: PGM-FI (Keihin, Renesas M32R)
Models: CBR600RR
Years: 2003-2006
Subsystem: CKP (crankshaft position) sensor
FI-light blink: 1 long, 9 short
Hex: 0x1901

Saw 19-01 as 1 long, 9 short on the FI light? Decode a blink pattern →

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Strongly inferred. Strongly inferred: the standard Honda meaning is well established, but exactly how this ECU handles it internally is inferred rather than fully confirmed.

What it means

The crankshaft position sensor is what the ECU uses to know engine speed and timing. Without it the ECU cannot run the engine, so a missing crank signal is usually a no-start. This code sets when the ECU counts no crank pulses while it should.

Conditions

Detection conditions

The ECU expects crank pulses during cranking or running but does not see them.

Sets the fault when

No crank signal is seen while it is expected (the ECU treats the engine as stopped).

Clears the fault when

Fix the underlying problem, then clear the stored codes with a diagnostic tool or the manufacturer’s reset procedure. If the fault is still present, the code returns the next time the ECU detects it.

Parts involved

Crankshaft position (CKP) sensor
Its signal wiring and trigger wheel

Symptoms & likely causes

Possible symptoms

FI (check-engine) light on
No RPM reading and a no-start

Likely causes

CKP signal open or shorted
Failed CKP sensor
Sensor air-gap or damaged trigger wheel

Diagnostic guidance

A crank no-signal fault is usually a no-start. Check the sensor air gap, wiring continuity, and trigger wheel. Later CBR600RR ECUs split this into 19-02 and 19-03.

How the ECU decides

A simplified view of the logic behind this code: a short C snippet with a plain-English summary. It shows the real decision the ECU makes without the low-level detail.

When the ECU confirms a fault, it saves the code and turns on the FI (check-engine) light. For a serious fault it also runs the engine on safe default values (limp-home) so you can still ride, with the light on.

C How a confirmed fault is stored

1// Once a fault is confirmed, remember it and warn the rider.
2if (fault_confirmed) {
3    store_code(code);      // kept until the codes are cleared
4    fi_light = ON;
5    if (fault_is_serious)
6        limp_home = ON;    // safe defaults so you can ride home
7}

Reverse-engineered interpretation · CBR600RR ECU reverse-engineering analysis

Related codes

Questions about code 19-01

What does Honda code 19-01 mean?: The ECU saw no crankshaft-position signal when it expected one. This is the standard Honda meaning for the code.
Which motorcycles does code 19-01 apply to?: It is documented here for the Honda CBR600RR (2003-2006). Other Honda models may use the same display code with a different meaning, so confirm against your model.
Can I still ride with code 19-01?: It depends on the fault. Code 19-01 relates to the CKP (crankshaft position) sensor. If the bike runs poorly or a safety-related system is affected, avoid riding until it is checked. The FI light stays on until the fault is fixed and the codes are cleared.
What should I check first for code 19-01?: A crank no-signal fault is usually a no-start. Check the sensor air gap, wiring continuity, and trigger wheel. Later CBR600RR ECUs split this into 19-02 and 19-03.

Sources

Every technical claim on this page traces to the research below. Source labels are sanitized; no local research paths are exposed.

firmware

2005-2006 Honda CBR600RR ECU firmware

Factory PGM-FI firmware for the 2005-2006 CBR600RR. Primary source of truth.
analysis

Firmware fault-code table extraction

Reads the list of codes the ECU can store directly out of each firmware.
reference

HondaECU project (open-source Honda ECU tool)

Community reference mapping Honda PGM-FI codes to their meanings.
analysis

CBR600RR ECU reverse-engineering analysis

Independent analysis of how the ECU detects, stores, and reports faults.

Content version 1.0.0 · last reviewed 2026-07-14

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